let isPositiveNum = val => {
return /^[1-9]\d*$/.test(val);
};
console.log(isPositiveNum(9))
console.log(isPositiveNum(2.2))
2.匹配负整数
let isNegativeNum = val => {
return /^-[1-9]\d*$/.test(val);
};
console.log(isNegativeNum(-9))
console.log(isNegativeNum(2.2))
3.匹配整数
let isInteger = val => {
return /^(-|\+)?\d+$/.test(val);
};
console.log(isInteger(-9))
console.log(isInteger(2.2))
4.匹配非负浮点数
let isNotNegativeFloatNum = val => {
return /^\d+(\.\d+)?$/.test(val);
};
console.log(isNotNegativeFloatNum(-9))
console.log(isNotNegativeFloatNum(2.2))
5.匹配由 26 个英文字母组成的字符串
let isAZaz = val => {
return /^[A-Za-z]+$/.test(val);
};
console.log(isAZaz('122a'))
console.log(isAZaz('abc'))
6.匹配由 26 个英文字母的大写组成的字符串
let isAZ = val => {
return /^[A-Z]+$/.test(val);
};
console.log(isAZ('Acs'))
console.log(isAZ('ABC'))
7.匹配由 26 个英文字母的小写组成的字符串
let isaz = val => {
return /^[a-z]+$/.test(val);
};
console.log(isaz('Acs'))
console.log(isaz('abc'))
8.匹配电子邮件地址
let isEmailAddress = val => {
return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(val) || /w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*/.test(val);
};
console.log(isEmailAddress('Acs'))
console.log(isEmailAddress('[email protected]'))
9.返回数组中的最大值
let arrayMax = arr => Math.max(...arr);
let arr = [1,2,3,5];
console.log(arrayMax(arr))
10.返回数组中的最小值
let arrayMin = arr => Math.min(...arr);
let arr = [1, 2, 3, 5];
console.log(arrayMin(arr))
11.将数组块划分为指定大小的较小数组
let chunk = (arr, size) => Array.from({
length: Math.ceil(arr.length / size)
}, (v, i) => arr.slice(i * size, i * size + size));
let arr = [1, 2, 3, 5];
console.log(chunk(arr,2))
12.从数组中移除 false 值
let compact = arr => arr.filter(Boolean);
let arr = [false,null,0,"",undefined,NaN,1]
console.log(compact(arr))
13.计算数组中值的出现次数
let countOccurrences = (arr, value) => arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0);
let arr = [1,2,1,2,3,3,3,3];
console.log(countOccurrences(arr,3))
14.深拼合数组
let deepFlatten= arr => [].concat(...arr.map(v => Array.isArray(v) ? deepFlatten(v) : v));
let arr = [1, 2, [1, 2, [1, 2, [2, 3]]]];
console.log(deepFlatten(arr))
15.返回两个数组之间的差异
let difference = (a, b) => {
const s = new Set(b);
return a.filter(x => !s.has(x));
};
let arr = [1,2,3];
let arr2 = [2,3,4];
console.log(difference(arr,arr2))
console.log(difference(arr2,arr))
16.返回数组的所有不同值
let distinctValuesOfArray = arr => [...new Set(arr)];
let arr = [1, 2, 3, 1, 2];
console.log(distinctValuesOfArray(arr))
17.返回数组中的每个第 n 个元素
let everyNth = (arr, nth) => arr.filter((e, i) => i % nth === 0);
18.筛选出数组中的非唯一值
let filterNonUnique = arr => arr.filter(i => arr.indexOf(i) !== arr.lastIndexOf(i));
20.拼合数组
let flatten = arr => arr.reduce((a, v) => a.concat(v), []);
21.将数组向上拼合到指定深度
22.根据给定函数对数组元素进行分组
23.返回列表的头
let head = arr => arr[0];
24.返回除最后一个数组之外的所有元素
let initial = arr => arr.slice(0, -1);
25.初始化并填充具有指定值的数组
let initializeArrayWithRange = (end, start = 0) => Array.from({
length: end - start
}).map((v, i) => i + start);
26.初始化并填充具有指定值的数组
let initializeArrayWithValues = (n, value = 0) => Array(n).fill(value);
27.返回两个数组中存在的元素的列表
let intersection = (a, b) => {
const s = new Set(b);
return a.filter(x => s.has(x));
};
28.返回数组中的最后一个元素
let last = arr => arr[arr.length - 1];
29.使用函数将数组的值映射到对象, 其中键值对由原始值作为键和映射值组成
let mapObject = (arr, fn) => (a => (a = [arr, arr.map(fn)], a[0].reduce((acc, val, ind) => (acc[val] = a[1][ind], acc), {})))
();
30.nthElement: 返回数组的第 n 个元素
let nthElement = (arr, n = 0) => (n > 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];
31.从对象中选取对应于给定键的键值对
let pick = (obj, arr) => arr.reduce((acc, curr) => (curr in obj && (acc[curr] = obj[curr]), acc), {});
32.对原始数组进行变异, 以筛选出指定的值
let pull = (arr, ...args) => {
let pulled = arr.filter((v, i) => !args.includes(v));
arr.length = 0;
pulled.forEach(v => arr.push(v));
};
33.从数组中移除给定函数返回false的元素
let remove = (arr, func) => Array.isArray(arr) ? arr.filter(func).reduce((acc, val) => {
arr.splice(arr.indexOf(val), 1);
return acc.concat(val);
}, []) : [];
34.返回数组中的随机元素
let sample = arr => arr[Math.floor(Math.random() * arr.length)];
35.随机数组值的顺序
let shuffle = arr => arr.sort(() => Math.random() - 0.5);
36.返回两个数组中都显示的元素的数组
let similarity = (arr, values) => arr.filter(v => values.includes(v));
37.返回两个数组之间的对称差
let symmetricDifference = (a, b) => {
const sA = new Set(a),
sB = new Set(b);
return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];
};
38.返回数组中的所有元素, 除第一个
let tail = arr => arr.length > 1 ? arr.slice(1) : arr;
39.返回一个数组, 其中 n 个元素从开始处移除
let take = (arr, n = 1) => arr.slice(0, n);
40.返回一个数组, 其中 n 个元素从末尾移除
let takeRight = (arr, n = 1) => arr.slice(arr.length - n, arr.length);
41.返回在两个数组中的任意一个中存在的每个元素
let union = (a, b) => Array.from(new Set([...a, ...b]));
42.筛选出数组中具有指定值之一的元素
let without = (arr, ...args) => arr.filter(v => !args.includes(v));
43.创建基于原始数组中的位置分组的元素数组
let zip = (...arrays) => {
const maxLength = Math.max(...arrays.map(x => x.length));
return Array.from({
length: maxLength
}).map((_, i) => {
return Array.from({
length: arrays.length
}, (_, k) => arrays[k][i]);
})
};
44.从给定数组中移除一项
let removeArrayItem = function(arr, item) {
var i = 0;
while (i < arr.length) {
if (arr[i] == item) {
arr.splice(i, 1);
} else {
i++;
}
}
return arr;
};
45.检查给定数组中是否包含某项
let contains = function(arr, item) {
var i = arr.length;
while (i--) {
if (arr[i] === item) {
return true;
}
}
return false;
};
46.验证不能包含字母
export const isNoWord = value => /^[^A-Za-z]*$/g.test(value);
47.验证中文和数字
export const isCHNAndEN = value => /^((?:[\u3400-\u4DB5\u4E00-\u9FEA\uFA0E\uFA0F\uFA11\uFA13\uFA14\uFA1F\uFA21\uFA23\uFA24\uFA27-\uFA29]|[\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879][\uDC00-\uDFFF]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0])|(\d))+$/g.test(value);
48.验证邮政编码(中国)
export const isPostcode = value => /^(0[1-7]|1[0-356]|2[0-7]|3[0-6]|4[0-7]|5[1-7]|6[1-7]|7[0-5]|8[013-6])\d{4}$/g.test(value);
49.验证微信号,6至20位,以字母开头,字母,数字,减号,下划线
export const isWeChatNum = value => /^[a-zA-Z][-_a-zA-Z0-9]{5,19}$/g.test(value);
50.验证16进制颜色
export const isColor16 = value => /^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/g.test(value);
51.验证火车车次
export const isTrainNum = value => /^[GCDZTSPKXLY1-9]\d{1,4}$/g.test(value);
52.验证手机机身码(IMEI)
export const isIMEI = value => /^\d{15,17}$/g.test(value);
53.验证必须带端口号的网址(或ip)
export const isHttpAndPort = value => /^((ht|f)tps?:\/\/)?[\w-]+(\.[\w-]+)+:\d{1,5}\/?$/g.test(value);
54.验证网址(支持端口和"?+参数"和"#+参数)
export const isRightWebsite = value => /^(((ht|f)tps?):\/\/)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&:/~+#-]*[\w@?^=%&/~+#-])?$/g.test(value);
55.验证统一社会信用代码
export const isCreditCode = value => /^[0-9A-HJ-NPQRTUWXY]{2}\d{6}[0-9A-HJ-NPQRTUWXY]{10}$/g.test(value);
56.验证迅雷链接
export const isThunderLink = value => /^thunderx?:\/\/[a-zA-Z\d]+=$/g.test(value);
57.验证ed2k链接(宽松匹配)
export const ised2k = value => /^ed2k:\/\/\|file\|.+\|\/$/g.test(value);
58.验证磁力链接(宽松匹配)
export const isMagnet = value => /^magnet:\?xt=urn:btih:[0-9a-fA-F]{40,}.*$/g.test(value);
59.验证子网掩码
export const isSubnetMask = value => /^(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])(?:\.(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])){3}$/g.test(value);
60.验证linux"文件夹"路径
export const isLinuxFolderPath = value => /^(\/[^/]+)+\/?$/g.test(value);
61.验证linux"文件"路径
export const isLinuxFilePath = value => /^(\/[^/]+)+$/g.test(value);
62.验证window"文件夹"路径
export const isWindowsFolderPath = value => /^[a-zA-Z]:\\(?:\w+\\?)*$/g.test(value);
63.验证window下"文件"路径
export const isWindowsFilePath = value => /^[a-zA-Z]:\\(?:\w+\\)*\w+\.\w+$/g.test(value);
64.验证股票代码(A股)
export const isAShare = value => /^(s[hz]|S[HZ])(000[\d]{3}|002[\d]{3}|300[\d]{3}|600[\d]{3}|60[\d]{4})$/g.test(value);
65.验证版本号格式必须为X.Y.Z
export const isVersion = value => /^\d+(?:\.\d+){2}$/g.test(value);
66.验证视频链接地址(视频格式可按需增删)
export const isVideoUrl = value => /^https?:\/\/(.+\/)+.+(\.(swf|avi|flv|mpg|rm|mov|wav|asf|3gp|mkv|rmvb|mp4))$/i.test(value);
67.验证图片链接地址(图片格式可按需增删)
export const isImageUrl = value => /^https?:\/\/(.+\/)+.+(\.(gif|png|jpg|jpeg|webp|svg|psd|bmp|tif))$/i.test(value);
68.验证银行卡号(10到30位, 覆盖对公/私账户, 参考微信支付)
export const isAccountNumber = value => /^[1-9]\d{9,29}$/g.test(value);
69.验证中文姓名
export const isChineseName = value => /^(?:[\u4e00-\u9fa5·]{2,16})$/g.test(value);
70.验证英文姓名
export const isEnglishName = value => /(^[a-zA-Z]{1}[a-zA-Z\s]{0,20}[a-zA-Z]{1}$)/g.test(value);
71.验证车牌号(新能源)
export const isLicensePlateNumberNER = value => /[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领 A-Z]{1}[A-HJ-NP-Z]{1}(([0-9]{5}[DF])|([DF][A-HJ-NP-Z0-9][0-9]{4}))$/g.test(value);
72.验证车牌号(非新能源)
export const isLicensePlateNumberNNER = value => /^[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领 A-Z]{1}[A-HJ-NP-Z]{1}[A-Z0-9]{4}[A-Z0-9挂学警港澳]{1}$/g.test(value);
73.验证车牌号(新能源+非新能源)
export const isLicensePlateNumber = value => /^(?:[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领 A-Z]{1}[A-HJ-NP-Z]{1}(?:(?:[0-9]{5}[DF])|(?:[DF](?:[A-HJ-NP-Z0-9])[0-9]{4})))|(?:[京津沪渝冀豫云辽黑湘皖鲁新苏浙赣鄂桂甘晋蒙陕吉闽贵粤青藏川宁琼使领 A-Z]{1}[A-Z]{1}[A-HJ-NP-Z0-9]{4}[A-HJ-NP-Z0-9 挂学警港澳]{1})$/g.test(value);
74.验证手机号中国(严谨), 根据工信部2019年最新公布的手机号段
export const isMPStrict = value => /^(?:(?:\+|00)86)?1(?:(?:3[\d])|(?:4[5-7|9])|(?:5[0-3|5-9])|(?:6[5-7])|(?:7[0-8])|(?:8[\d])|(?:9[1|8|9]))\d{8}$/g.test(value);
75.验证手机号中国(宽松), 只要是13,14,15,16,17,18,19开头即可
export const isMPRelaxed = value => /^(?:(?:\+|00)86)?1[3-9]\d{9}$/g.test(value);
76.验证email(邮箱)
export const isEmail = value => /^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/g.test(value);
77.验证座机电话(国内),如: 0341-86091234
export const isLandlineTelephone = value => /\d{3}-\d{8}|\d{4}-\d{7}/g.test(value);
78.验证身份证号(1代,15位数字)
/**
@param { string } value
*/
export const isIDCardOld = value => /^\d{8}(0\d|10|11|12)([0-2]\d|30|31)\d{3}$/g.test(value);
79.验证身份证号(2代,18位数字),最后一位是校验位,可能为数字或字符X
/**
@param { string } value
*/
export const isIDCardNew = value => /^\d{6}(18|19|20)\d{2}(0\d|10|11|12)([0-2]\d|30|31)\d{3}[\dXx]$/g.test(value);
80.验证身份证号, 支持1/2代(15位/18位数字)
/**
@param { string } value
*/
export const isIDCard = value => /(^\d{8}(0\d|10|11|12)([0-2]\d|30|31)\d{3}$)|(^\d{6}(18|19|20)\d{2}(0\d|10|11|12)([0-2]\d|30|31)\d{3}(\d|X|x)$)/g.test(value);
81.验证护照(包含香港、澳门)
/**
@param { string } value
*/
export const isPassport = value => /(^[EeKkGgDdSsPpHh]\d{8}$)|(^(([Ee][a-fA-F])|([DdSsPp][Ee])|([Kk][Jj])|([Mm][Aa])|(1[45]))\d{7}$)/g.test(value);
82.验证帐号是否合法(字母开头,允许5-16字节,允许字母数字下划线组合
/**
@param { string } value
*/
export const isWebAccount = value => /^[a-zA-Z]\w{4,15}$/g.test(value);
83.验证中文/汉字
/**
@param { string } value
*/
export const isChineseCharacter = value => /^(?:[\u3400-\u4DB5\u4E00-\u9FEA\uFA0E\uFA0F\uFA11\uFA13\uFA14\uFA1F\uFA21\uFA23\uFA24\uFA27-\uFA29]|[\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879][\uDC00-\uDFFF]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0])+$/g.test(value);
84.验证小数
/**
@param { string } value
*/
export const isDecimal = value => /^\d+\.\d+$/g.test(value);
85.验证数字
/**
@param { string } value
*/
export const isNumber = value => /^\d{1,}$/g.test(value);
86.验证qq号格式
/**
@param { string } value
*/
export const isQQNum = value => /^[1-9][0-9]{4,10}$/g.test(value);
87.验证数字和字母组成
/**
@param { string } value
*/
export const isNumAndStr = value => /^[A-Za-z0-9]+$/g.test(value);
88.验证英文字母
/**
@param { string } value
*/
export const isEnglish = value => /^[a-zA-Z]+$/g.test(value);
89.验证大写英文字母
/**
@param { string } value
*/
export const isCapital = value => /^[A-Z]+$/g.test(value);
90.验证小写英文字母
/**
@param { string } value
*/
export const isLowercase = value => /^[a-z]+$/g.test(value);
浏览器操作相关browser工具函数
91.返回当前url
export const currentURL = () => window.location.href;
92.获取url参数(第一种)
/**
* @param {*} name
* @param {*} origin
*/
export function getUrlParam(name, origin = null) {
let reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
let r = null;
if (origin == null) {
r = window.location.search.substr(1).match(reg);
} else {
r = origin.substr(1).match(reg);
}
if (r != null) return decodeURIComponent(r[2]);
return null;
}
93.获取url参数(第二种)
/**
* @param {*} name
* @param {*} origin
*/
export function getUrlParams(name, origin = null) {
let url = location.href;
let temp1 = url.split('?');
let pram = temp1[1];
let keyValue = pram.split('&');
let obj = {};
for (let i = 0; i < keyValue.length; i++) {
let item = keyValue[i].split('=');
let key = item[0];
let value = item[1];
obj[key] = value;
}
return obj[name];
}
94.修改url中的参数
/**
* @param { string } paramName
* @param { string } replaceWith
*/
export function replaceParamVal(paramName,replaceWith) {
var oUrl = location.href.toString();
var re=eval('/('+ paramName+'=)([^&]*)/gi');
location.href = oUrl.replace(re,paramName+'='+replaceWith);
return location.href;
}
95.删除url中指定的参数
/**
* @param { string } name
*/
export function funcUrlDel(name){
var loca =location;
var baseUrl = loca.origin + loca.pathname + "?";
var query = loca.search.substr(1);
if (query.indexOf(name)>-1) {
var obj = {};
var arr = query.split("&");
for (var i = 0; i < arr.length; i++) {
arr[i] = arr[i].split("=");
obj[arr[i][0]] = arr[i][1];
}
delete obj[name];
var url = baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&");
return url
}
}
96.获取窗口可视范围的高度
export function getClientHeight() {
let clientHeight = 0;
if (document.body.clientHeight && document.documentElement.clientHeight) {
clientHeight = (document.body.clientHeight < document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;
}
else {
clientHeight = (document.body.clientHeight > document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;
}
return clientHeight;
}
97.获取窗口可视范围宽度
export function getPageViewWidth() {
let d = document,
a = d.compatMode == "BackCompat" ? d.body : d.documentElement;
return a.clientWidth;
}
98.获取窗口宽度
export function getPageWidth() {
let g = document,
a = g.body,
f = g.documentElement,
d = g.compatMode == "BackCompat" ? a : g.documentElement;
return Math.max(f.scrollWidth, a.scrollWidth, d.clientWidth);
}
99.获取窗口尺寸
export function getViewportOffset() {
if (window.innerWidth) {
return {
w: window.innerWidth,
h: window.innerHeight
}
} else {
if (document.compatMode === "BackCompat") {
// 怪异模式
return {
w: document.body.clientWidth,
h: document.body.clientHeight
}
} else {
// 标准模式
return {
w: document.documentElement.clientWidth,
h: document.documentElement.clientHeight
}
}
}
}
100.获取滚动条距顶部高度
export function getPageScrollTop() {
let a = document;
return a.documentElement.scrollTop || a.body.scrollTop;
}
101.获取滚动条距左边的高度
export function getPageScrollLeft() {
let a = document;
return a.documentElement.scrollLeft || a.body.scrollLeft;
}
102.开启全屏
/**
* @param {*} element
*/
export function launchFullscreen(element) {
if (element.requestFullscreen) {
element.requestFullscreen()
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen()
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen()
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullScreen()
}
}
103.关闭全屏
export function exitFullscreen() {
if (document.exitFullscreen) {
document.exitFullscreen()
} else if (document.msExitFullscreen) {
document.msExitFullscreen()
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen()
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen()
}
}
104.返回当前滚动条位置
export const getScrollPosition = (el = window) => ({
x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
});
105.滚动到指定元素区域
export const smoothScroll = element =>{
document.querySelector(element).scrollIntoView({
behavior: 'smooth'
});
};
106.平滑滚动到页面顶部
export const scrollToTop = () => {
const c = document.documentElement.scrollTop || document.body.scrollTop;
if (c > 0) {
window.requestAnimationFrame(scrollToTop);
window.scrollTo(0, c - c / 8);
}
};
107.http跳转https
export const httpsRedirect = () => {
if (location.protocol !== 'https:') location.replace('https://' + location.href.split('//')[1]);
};
108.检查页面底部是否可见
export const bottomVisible = () =>{
return document.documentElement.clientHeight + window.scrollY >=
(document.documentElement.scrollHeight || document.documentElement.clientHeight);
};
109.打开一个窗口
/**
* @param { string } url
* @param { string } windowName
* @param { number } width
* @param { number } height
*/
export function openWindow(url, windowName, width, height) {
var x = parseInt(screen.width / 2.0) - width / 2.0;
var y = parseInt(screen.height / 2.0) - height / 2.0;
var isMSIE = navigator.appName == "Microsoft Internet Explorer";
if (isMSIE) {
var p = "resizable=1,location=no,scrollbars=no,width=";
p = p + width;
p = p + ",height=";
p = p + height;
p = p + ",left=";
p = p + x;
p = p + ",top=";
p = p + y;
window.open(url, windowName, p);
} else {
var win = window.open(
url,
"ZyiisPopup",
"top=" +
y +
",left=" +
x +
",scrollbars=" +
scrollbars +
",dialog=yes,modal=yes,width=" +
width +
",height=" +
height +
",resizable=no"
);
eval("try { win.resizeTo(width, height); } catch(e) { }");
win.focus();
}
}
110.自适应页面(rem)
/**
* @param { number } width
*/
export function AutoResponse(width = 750) {
const target = document.documentElement;
target.clientWidth >= 600
? (target.style.fontSize = "80px")
: (target.style.fontSize = target.clientWidth / width * 100 + "px");
}
日期工具date工具函数
111.浏览器存储相关storage工具函数
主要为浏览器存储方面的工具函数,大部分搬运自大神火狼1
112.localStorage 存贮
/**
* 目前对象值如果是函数 、RegExp等特殊对象存贮会被忽略
* @param { String } key 属性
* @param { string } value 值
*/
export const localStorageSet = (key, value) => {
if (typeof (value) === 'object') value = JSON.stringify(value);
localStorage.setItem(key, value)
};
113.localStorage 获取
/**
* @param {String} key 属性
*/
export const localStorageGet = (key) => {
return localStorage.getItem(key)
};
114.localStorage 移除
/**
* @param {String} key 属性
*/
export const localStorageRemove = (key) => {
localStorage.removeItem(key)
};
115.localStorage 存贮某一段时间失效
/**
* @param {String} key 属性
* @param {*} value 存贮值
* @param { number } expire 过期时间,毫秒数
*/
export const localStorageSetExpire = (key, value, expire) => {
if (typeof (value) === 'object') value = JSON.stringify(value);
localStorage.setItem(key, value);
setTimeout(() => {
localStorage.removeItem(key)
}, expire)
};
116.sessionStorage 存贮
/**
* @param {String} key 属性
* @param {*} value 值
*/
export const sessionStorageSet = (key, value) => {
if (typeof (value) === 'object') value = JSON.stringify(value);
sessionStorage.setItem(key, value)
};
117.sessionStorage 获取
/**
* @param {String} key 属性
*/
export const sessionStorageGet = (key) => {
return sessionStorage.getItem(key)
};
118.sessionStorage 删除
/**
* @param {String} key 属性
*/
export const sessionStorageRemove = (key) => {
sessionStorage.removeItem(key)
};
119.sessionStorage 存贮某一段时间失效
/**
* @param {String} key 属性
* @param {*} value 存贮值
* @param {String} expire 过期时间,毫秒数
*/
export const sessionStorageSetExpire = (key, value, expire) => {
if (typeof (value) === 'object') value = JSON.stringify(value);
sessionStorage.setItem(key, value);
setTimeout(() => {
sessionStorage.removeItem(key)
}, expire)
};
120.cookie 存贮
/**
* @param {String} key 属性
* @param {*} value 值
* @param { String } expire 过期时间,单位天
*/
export const cookieSet = (key, value, expire) => {
const d = new Date();
d.setDate(d.getDate() + expire);
document.cookie = `${key}=${value};expires=${d.toUTCString()}`
};
121.cookie 获取
export const cookieGet = (key) => {
const cookieStr = unescape(document.cookie);
const arr = cookieStr.split('; ');
let cookieValue = '';
for (let i = 0; i < arr.length; i++) {
const temp = arr[i].split('=');
if (temp[0] === key) {
cookieValue = temp[1];
break
}
}
return cookieValue
};
122.cookie 删除
/**
* @param {String} key 属性
*/
export const cookieRemove = (key) => {
document.cookie = `${encodeURIComponent(key)}=;expires=${new Date()}`
};
123.更多的工具函数
这里包含了平时可能常用的工具函数,包含数字,字符串,数组和对象等等操作。
124.金钱格式化,三位加逗号
/**
* @param { number } num
*/
export const formatMoney = num => num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
125.截取字符串并加身略号
export function subText(str, length) {
if (str.length === 0) {
return '';
}
if (str.length > length) {
return str.substr(0, length) + "...";
} else {
return str;
}
}
126.获取文件base64编码
/**
* @param file
* @param format 指定文件格式
* @param size 指定文件大小(字节)
* @param formatMsg 格式错误提示
* @param sizeMsg 大小超出限制提示
* @returns {Promise}
*/
export function fileToBase64String(file, format = ['jpg', 'jpeg', 'png', 'gif'], size = 20 * 1024 * 1024, formatMsg = '文件格式不正确', sizeMsg = '文件大小超出限制') {
return new Promise((resolve, reject) => {
// 格式过滤
let suffix = file.type.split('/')[1].toLowerCase();
let inFormat = false;
for (let i = 0; i < format.length; i++) {
if (suffix === format[i]) {
inFormat = true;
break;
}
}
if (!inFormat) {
reject(formatMsg);
}
// 大小过滤
if (file.size > size) {
reject(sizeMsg);
}
// 转base64字符串
let fileReader = new FileReader();
fileReader.readAsDataURL(file);
fileReader.onload = () => {
let res = fileReader.result;
resolve({base64String: res, suffix: suffix});
reject('异常文件,请重新选择');
}
})
}
127.B转换到KB,MB,GB并保留两位小数
/**
* @param { number } fileSize
*/
export function formatFileSize(fileSize) {
let temp;
if (fileSize < 1024) {
return fileSize + 'B';
} else if (fileSize < (1024 * 1024)) {
temp = fileSize / 1024;
temp = temp.toFixed(2);
return temp + 'KB';
} else if (fileSize < (1024 * 1024 * 1024)) {
temp = fileSize / (1024 * 1024);
temp = temp.toFixed(2);
return temp + 'MB';
} else {
temp = fileSize / (1024 * 1024 * 1024);
temp = temp.toFixed(2);
return temp + 'GB';
}
}
128.base64转file
/**
* @param { base64 } base64
* @param { string } filename 转换后的文件名
*/
export const base64ToFile = (base64, filename )=> {
let arr = base64.split(',');
let mime = arr[0].match(/:(.*?);/)[1];
let suffix = mime.split('/')[1] ;// 图片后缀
let bstr = atob(arr[1]);
let n = bstr.length;
let u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n)
}
return new File([u8arr], `${filename}.${suffix}`, { type: mime })
};
129.base64转blob
/**
* @param { base64 } base64
*/
export const base64ToBlob = base64 => {
let arr = base64.split(','),
mime = arr[0].match(/:(.*?);/)[1],
bstr = atob(arr[1]),
n = bstr.length,
u8arr = new Uint8Array(n);
while (n--) {
u8arr[n] = bstr.charCodeAt(n);
}
return new Blob([u8arr], { type: mime });
};
130.blob转file
/**
* @param { blob } blob
* @param { string } fileName
*/
export const blobToFile = (blob, fileName) => {
blob.lastModifiedDate = new Date();
blob.name = fileName;
return blob;
};
131.file转base64
/**
* @param { * } file 图片文件
*/
export const fileToBase64 = file => {
let reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) {
return e.target.result
};
};
132.递归生成树形结构
export function getTreeData(data, pid, pidName = 'parentId', idName = 'id', childrenName = 'children', key) {
let arr = [];
for (let i = 0; i < data.length; i++) {
if (data[i][pidName] == pid) {
data[i].key = data[i][idName];
data[i][childrenName] = getTreeData(data, data[i][idName], pidName, idName, childrenName);
arr.push(data[i]);
}
}
return arr;
}
133.遍历树节点
export function foreachTree(data, childrenName = 'children', callback) {
for (let i = 0; i < data.length; i++) {
callback(data[i]);
if (data[i][childrenName] && data[i][childrenName].length > 0) {
foreachTree(data[i][childrenName], childrenName, callback);
}
}
}
134.追溯父节点
export function traceParentNode(pid, data, rootPid, pidName = 'parentId', idName = 'id', childrenName = 'children') {
let arr = [];
foreachTree(data, childrenName, (node) => {
if (node[idName] == pid) {
arr.push(node);
if (node[pidName] != rootPid) {
arr = arr.concat(traceParentNode(node[pidName], data, rootPid, pidName, idName));
}
}
});
return arr;
}
135.寻找所有子节点
export function traceChildNode(id, data, pidName = 'parentId', idName = 'id', childrenName = 'children') {
let arr = [];
foreachTree(data, childrenName, (node) => {
if (node[pidName] == id) {
arr.push(node);
arr = arr.concat(traceChildNode(node[idName], data, pidName, idName, childrenName));
}
});
return arr;
}
136.根据pid生成树形结构
/**
* @param { object } items 后台获取的数据
* @param { * } id 数据中的id
* @param { * } link 生成树形结构的依据
*/
export const createTree = (items, id = null, link = 'pid') =>{
items.filter(item => item[link] === id).map(item => ({ ...item, children: createTree(items, item.id) }));
};
137.查询数组中是否存在某个元素并返回元素第一次出现的下标
/**
* @param {*} item
* @param { array } data
*/
export function inArray(item, data) {
for (let i = 0; i < data.length; i++) {
if (item === data[i]) {
return i;
}
}
return -1;
}
138.Windows根据详细版本号判断当前系统名称
/**
* @param { string } osVersion
*/
export function OutOsName(osVersion) {
if(!osVersion){
return
}
let str = osVersion.substr(0, 3);
if (str === "5.0") {
return "Win 2000"
} else if (str === "5.1") {
return "Win XP"
} else if (str === "5.2") {
return "Win XP64"
} else if (str === "6.0") {
return "Win Vista"
} else if (str === "6.1") {
return "Win 7"
} else if (str === "6.2") {
return "Win 8"
} else if (str === "6.3") {
return "Win 8.1"
} else if (str === "10.") {
return "Win 10"
} else {
return "Win"
}
}
139.判断手机是Andoird还是IOS
/**
* 0: ios
* 1: android
* 2: 其它
*/
export function getOSType() {
let u = navigator.userAgent, app = navigator.appVersion;
let isAndroid = u.indexOf('Android') > -1 || u.indexOf('Linux') > -1;
let isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
if (isIOS) {
return 0;
}
if (isAndroid) {
return 1;
}
return 2;
}
140.函数防抖
/**
* @param { function } func
* @param { number } wait 延迟执行毫秒数
* @param { boolean } immediate true 表立即执行,false 表非立即执行
*/
export function debounce(func,wait,immediate) {
let timeout;
return function () {
let context = this;
let args = arguments;
if (timeout) clearTimeout(timeout);
if (immediate) {
let callNow = !timeout;
timeout = setTimeout(() => {
timeout = null;
}, wait);
if (callNow) func.apply(context, args)
}
else {
timeout = setTimeout(() => {
func.apply(context, args)
}, wait);
}
}
}
145.函数节流
/**
* @param { function } func 函数
* @param { number } wait 延迟执行毫秒数
* @param { number } type 1 表时间戳版,2 表定时器版
*/
export function throttle(func, wait ,type) {
let previous, timeout;
if(type===1){
previous = 0;
}else if(type===2){
timeout = null;
}
return function() {
let context = this;
let args = arguments;
if(type===1){
let now = Date.now();
if (now - previous > wait) {
func.apply(context, args);
previous = now;
}
}else if(type===2){
if (!timeout) {
timeout = setTimeout(() => {
timeout = null;
func.apply(context, args)
}, wait)
}
}
}
}
146.判断数据类型
/**
* @param {*} target
*/
export function type(target) {
let ret = typeof(target);
let template = {
"[object Array]": "array",
"[object Object]":"object",
"[object Number]":"number - object",
"[object Boolean]":"boolean - object",
"[object String]":'string-object'
};
if(target === null) {
return 'null';
}else if(ret == "object"){
let str = Object.prototype.toString.call(target);
return template[str];
}else{
return ret;
}
}
147.生成指定范围随机数
/**
* @param { number } min
* @param { number } max
*/
export const RandomNum = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;
148.数组乱序
/**
* @param {array} arr
*/
export function arrScrambling(arr) {
let array = arr;
let index = array.length;
while (index) {
index -= 1;
let randomIndex = Math.floor(Math.random() * index);
let middleware = array[index];
array[index] = array[randomIndex];
array[randomIndex] = middleware
}
return array
}
150.数组交集
/**
* @param { array} arr1
* @param { array } arr2
*/
export const similarity = (arr1, arr2) => arr1.filter(v => arr2.includes(v));
151.数组中某元素出现的次数
/**
* @param { array } arr
* @param {*} value
*/
export function countOccurrences(arr, value) {
return arr.reduce((a, v) => v === value ? a + 1 : a + 0, 0);
}
152.加法函数(精度丢失问题)
/**
* @param { number } arg1
* @param { number } arg2
*/
export function add(arg1, arg2) {
let r1, r2, m;
try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
m = Math.pow(10, Math.max(r1, r2));
return (arg1 * m + arg2 * m) / m
}
153.减法函数(精度丢失问题)
/**
* @param { number } arg1
* @param { number } arg2
*/
export function sub(arg1, arg2) {
let r1, r2, m, n;
try { r1 = arg1.toString().split(".")[1].length } catch (e) { r1 = 0 }
try { r2 = arg2.toString().split(".")[1].length } catch (e) { r2 = 0 }
m = Math.pow(10, Math.max(r1, r2));
n = (r1 >= r2) ? r1 : r2;
return Number(((arg1 * m - arg2 * m) / m).toFixed(n));
}
154.除法函数(精度丢失问题)
/**
* @param { number } num1
* @param { number } num2
*/
export function division(num1,num2){
let t1,t2,r1,r2;
try{
t1 = num1.toString().split('.')[1].length;
}catch(e){
t1 = 0;
}
try{
t2=num2.toString().split(".")[1].length;
}catch(e){
t2=0;
}
r1=Number(num1.toString().replace(".",""));
r2=Number(num2.toString().replace(".",""));
return (r1/r2)*Math.pow(10,t2-t1);
}
155.乘法函数(精度丢失问题)
/**
* @param { number } num1
* @param { number } num2
*/
export function mcl(num1,num2){
let m=0,s1=num1.toString(),s2=num2.toString();
try{m+=s1.split(".")[1].length}catch(e){}
try{m+=s2.split(".")[1].length}catch(e){}
return Number(s1.replace(".",""))*Number(s2.replace(".",""))/Math.pow(10,m);
}
156.递归优化(尾递归)
/**
* @param { function } f
*/
export function tco(f) {
let value;
let active = false;
let accumulated = [];
return function accumulator() {
accumulated.push(arguments);
if (!active) {
active = true;
while (accumulated.length) {
value = f.apply(this, accumulated.shift());
}
active = false;
return value;
}
};
}
157.生成随机整数
export function randomNumInteger(min, max) {
switch (arguments.length) {
case 1:
return parseInt(Math.random() * min + 1, 10);
case 2:
return parseInt(Math.random() * (max - min + 1) + min, 10);
default:
return 0
}
}
158.去除空格
/**
* @param { string } str 待处理字符串
* @param { number } type 去除空格类型 1-所有空格 2-前后空格 3-前空格 4-后空格 默认为1
*/
export function trim(str, type = 1) {
if (type && type !== 1 && type !== 2 && type !== 3 && type !== 4) return;
switch (type) {
case 1:
return str.replace(/\s/g, "");
case 2:
return str.replace(/(^\s)|(\s*$)/g, "");
case 3:
return str.replace(/(^\s)/g, "");
case 4:
return str.replace(/(\s$)/g, "");
default:
return str;
}
}
159.大小写转换
/**
* @param { string } str 待转换的字符串
* @param { number } type 1-全大写 2-全小写 3-首字母大写 其他-不转换
*/
export function turnCase(str, type) {
switch (type) {
case 1:
return str.toUpperCase();
case 2:
return str.toLowerCase();
case 3:
return str[0].toUpperCase() + str.substr(1).toLowerCase();
default:
return str;
}
}
160.随机16进制颜色 hexColor
/**
* 方法一
*/
export function hexColor() {
let str = '#';
let arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 'A', 'B', 'C', 'D', 'E', 'F'];
for (let i = 0; i < 6; i++) {
let index = Number.parseInt((Math.random() * 16).toString());
str += arr[index]
}
return str;
}
161.随机16进制颜色 randomHexColorCode
/**
* 方法二
*/
export const randomHexColorCode = () => {
let n = (Math.random() * 0xfffff * 1000000).toString(16);
return '#' + n.slice(0, 6);
};
162.转义html(防XSS攻击)
export const escapeHTML = str =>{
str.replace(
/[&<>'"]/g,
tag =>
({
'&': '&',
'<': '<',
'>': '>',
"'": ''',
'"': '"'
}[tag] || tag)
);
};
163.检测移动/PC设备
export const detectDeviceType = () => { return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ? 'Mobile' : 'Desktop'; };
164.隐藏所有指定标签
/**
* 例: hide(document.querySelectorAll('img'))
*/
export const hideTag = (...el) => [...el].forEach(e => (e.style.display = 'none'));
165.返回指定元素的生效样式
/**
* @param { element} el 元素节点
* @param { string } ruleName 指定元素的名称
*/
export const getStyle = (el, ruleName) => getComputedStyle(el)[ruleName];
166.检查是否包含子元素
/**
* @param { element } parent
* @param { element } child
* 例:elementContains(document.querySelector('head'), document.querySelector('title')); // true
*/
export const elementContains = (parent, child) => parent !== child && parent.contains(child);
167.数字超过规定大小加上加号“+”,如数字超过99显示99+
/**
* @param { number } val 输入的数字
* @param { number } maxNum 数字规定界限
*/
export const outOfNum = (val, maxNum) =>{
val = val ? val-0 :0;
if (val > maxNum ) {
return `${maxNum}+`
}else{
return val;
}
};
168.如何隐藏所有指定的元素
const hide = (el) => Array.from(el).forEach(e => (e.style.display = 'none'));
// 事例:隐藏页面上所有`<img>`元素?
hide(document.querySelectorAll('img'))
169.如何检查元素是否具有指定的类?
页面DOM里的每个节点上都有一个classList对象,程序员可以使用里面的方法新增、删除、修改节点上的CSS类。使用classList,程序员还可以用它来判断某个节点是否被赋予了某个CSS类。
const hasClass = (el, className) => el.classList.contains(className)
// 事例
hasClass(document.querySelector('p.special'), 'special') // true
170.如何切换一个元素的类?
const toggleClass = (el, className) => el.classList.toggle(className)
// 事例 移除 p 具有类`special`的 special 类
toggleClass(document.querySelector('p.special'), 'special')
171.如何获取当前页面的滚动位置?
const getScrollPosition = (el = window) => ({
x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
});
// 事例
getScrollPosition(); // {x: 0, y: 200}
172.如何平滑滚动到页面顶部
const scrollToTop = () => {
const c = document.documentElement.scrollTop || document.body.scrollTop;
if (c > 0) {
window.requestAnimationFrame(scrollToTop);
window.scrollTo(0, c - c / 8);
}
}
// 事例
scrollToTop()
window.requestAnimationFrame() 告诉浏览器——你希望执行一个动画,并且要求浏览器在下次重绘之前调用指定的回调函数更新动画。该方法需要传入一个回调函数作为参数,该回调函数会在浏览器下一次重绘之前执行。
requestAnimationFrame:优势:由系统决定回调函数的执行时机。60Hz的刷新频率,那么每次刷新的间隔中会执行一次回调函数,不会引起丢帧,不会卡顿。
window.requestAnimationFrame() 告诉浏览器——你希望执行一个动画,并且要求浏览器在下次重绘之前调用指定的回调函数更新动画。该方法需要传入一个回调函数作为参数,该回调函数会在浏览器下一次重绘之前执行。
requestAnimationFrame:优势:由系统决定回调函数的执行时机。60Hz的刷新频率,那么每次刷新的间隔中会执行一次回调函数,不会引起丢帧,不会卡顿。
173.如何检查父元素是否包含子元素?
const elementContains = (parent, child) => parent !== child && parent.contains(child);
// 事例
elementContains(document.querySelector('head'), document.querySelector('title'));
// true
elementContains(document.querySelector('body'), document.querySelector('body'));
// false
174.如何检查指定的元素在视口中是否可见?
const elementIsVisibleInViewport = (el, partiallyVisible = false) => {
const { top, left, bottom, right } = el.getBoundingClientRect();
const { innerHeight, innerWidth } = window;
return partiallyVisible
? ((top > 0 && top < innerHeight) || (bottom > 0 && bottom < innerHeight)) &&
((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth))
: top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;
};
// 事例
elementIsVisibleInViewport(el); // 需要左右可见
elementIsVisibleInViewport(el, true); // 需要全屏(上下左右)可以见
175.如何获取元素中的所有图像?
const getImages = (el, includeDuplicates = false) => {
const images = [...el.getElementsByTagName('img')].map(img => img.getAttribute('src'));
return includeDuplicates ? images : [...new Set(images)];
};
// 事例:includeDuplicates 为 true 表示需要排除重复元素
getImages(document, true); // ['image1.jpg', 'image2.png', 'image1.png', '...']
getImages(document, false); // ['image1.jpg', 'image2.png', '...']
176.如何确定设备是移动设备还是台式机/笔记本电脑?
const detectDeviceType = () =>
/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)
? 'Mobile'
: 'Desktop';
// 事例
detectDeviceType(); // "Mobile" or "Desktop"
177.How to get the current URL?
const currentURL = () => window.location.href
// 事例
currentURL() // 'https://google.com'
178.如何创建一个包含当前URL参数的对象?
const getURLParameters = url =>
(url.match(/([^?=&]+)(=([^&]*))/g) || []).reduce(
(a, v) => ((a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1)), a),
{}
);
// 事例
getURLParameters('http://url.com/page?n=Adam&s=Smith'); // {n: 'Adam', s: 'Smith'}
getURLParameters('google.com'); // {}
179.如何将一组表单元素转化为对象?
const formToObject = form =>
Array.from(new FormData(form)).reduce(
(acc, [key, value]) => ({
...acc,
[key]: value
? }),
? {}
);
// 事例
formToObject(document.querySelector('#form'));
// { email: '[email protected]', name: 'Test Name' }
180.如何从对象检索给定选择器指示的一组属性?
const get = (from, ...selectors) =>
[...selectors].map(s =>
s
.replace(/\[([^\[\]]*)\]/g, '.$1.')
.split('.')
.filter(t => t !== '')
.reduce((prev, cur) => prev && prev[cur], from)
);
const obj = { selector: { to: { val: 'val to select' } }, target: [1, 2, { a: 'test' }] };
// Example
get(obj, 'selector.to.val', 'target[0]', 'target[2].a');
// ['val to select', 1, 'test']
181.如何在等待指定时间后调用提供的函数?
const delay = (fn, wait, ...args) => setTimeout(fn, wait, ...args);
delay(
function(text) {
console.log(text);
},
1000,
'later'
);
// 1秒后打印 'later'
182.如何在给定元素上触发特定事件且能选择地传递自定义数据?
const triggerEvent = (el, eventType, detail) =>
el.dispatchEvent(new CustomEvent(eventType, { detail }));
// 事例
triggerEvent(document.getElementById('myId'), 'click');
triggerEvent(document.getElementById('myId'), 'click', { username: 'bob' });
自定义事件的函数有 Event、CustomEvent 和 dispatchEvent
// 向 window派发一个resize内置事件
window.dispatchEvent(new Event('resize'))
// 直接自定义事件,使用 Event 构造函数:
var event = new Event('build');
var elem = document.querySelector('#id')
// 监听事件
elem.addEventListener('build', function (e) { ... }, false);
// 触发事件.
elem.dispatchEvent(event);
CustomEvent 可以创建一个更高度自定义事件,还可以附带一些数据,具体用法如下:
var myEvent = new CustomEvent(eventname, options);
其中 options 可以是:
{
detail: {
...
},
bubbles: true, //是否冒泡
cancelable: false //是否取消默认事件
}
其中 detail 可以存放一些初始化的信息,可以在触发的时候调用。其他属性就是定义该事件是否具有冒泡等等功能。
内置的事件会由浏览器根据某些操作进行触发,自定义的事件就需要人工触发。
dispatchEvent 函数就是用来触发某个事件:
element.dispatchEvent(customEvent);
上面代码表示,在 element 上面触发 customEvent 这个事件。
// add an appropriate event listener
obj.addEventListener("cat", function(e) { process(e.detail) });
// create and dispatch the event
var event = new CustomEvent("cat", {"detail":{"hazcheeseburger":true}});
obj.dispatchEvent(event);
使用自定义事件需要注意兼容性问题,而使用 jQuery 就简单多了:
// 绑定自定义事件
$(element).on('myCustomEvent', function(){});
// 触发事件
$(element).trigger('myCustomEvent');
// 此外,你还可以在触发自定义事件时传递更多参数信息:
$( "p" ).on( "myCustomEvent", function( event, myName ) {
$( this ).text( myName + ", hi there!" );
});
$( "button" ).click(function () {
$( "p" ).trigger( "myCustomEvent", [ "John" ] );
});
183.如何从元素中移除事件监听器?
const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);
const fn = () => console.log('!');
document.body.addEventListener('click', fn);
off(document.body, 'click', fn);
184.如何获得给定毫秒数的可读格式?
const formatDuration = ms => {
if (ms < 0) ms = -ms;
const time = {
day: Math.floor(ms / 86400000),
hour: Math.floor(ms / 3600000) % 24,
minute: Math.floor(ms / 60000) % 60,
second: Math.floor(ms / 1000) % 60,
millisecond: Math.floor(ms) % 1000
};
return Object.entries(time)
.filter(val => val[1] !== 0)
.map(([key, val]) => `${val} ${key}${val !== 1 ? 's' : ''}`)
.join(', ');
};
// 事例
formatDuration(1001); // '1 second, 1 millisecond'
formatDuration(34325055574);
// '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'
185.如何获得两个日期之间的差异(以天为单位)?
const getDaysDiffBetweenDates = (dateInitial, dateFinal) =>
(dateFinal - dateInitial) / (1000 * 3600 * 24);
// 事例
getDaysDiffBetweenDates(new Date('2017-12-13'), new Date('2017-12-22')); // 9
186.如何向传递的URL发出GET请求?
const httpGet = (url, callback, err = console.error) => {
const request = new XMLHttpRequest();
request.open('GET', url, true);
request.onload = () => callback(request.responseText);
request.onerror = () => err(request);
request.send();
};
httpGet(
'https://jsonplaceholder.typicode.com/posts/1',
console.log
);
// {"userId": 1, "id": 1, "title": "sample title", "body": "my text"}
187.如何对传递的URL发出POST请求?
const httpPost = (url, data, callback, err = console.error) => {
const request = new XMLHttpRequest();
request.open('POST', url, true);
request.setRequestHeader('Content-type', 'application/json; charset=utf-8');
request.onload = () => callback(request.responseText);
request.onerror = () => err(request);
request.send(data);
};
const newPost = {
userId: 1,
id: 1337,
title: 'Foo',
body: 'bar bar bar'
};
const data = JSON.stringify(newPost);
httpPost(
'https://jsonplaceholder.typicode.com/posts',
data,
console.log
);
// {"userId": 1, "id": 1337, "title": "Foo", "body": "bar bar bar"}
188.如何为指定选择器创建具有指定范围,步长和持续时间的计数器?
const counter = (selector, start, end, step = 1, duration = 2000) => {
let current = start,
_step = (end - start) * step < 0 ? -step : step,
timer = setInterval(() => {
current += _step;
document.querySelector(selector).innerHTML = current;
if (current >= end) document.querySelector(selector).innerHTML = end;
if (current >= end) clearInterval(timer);
}, Math.abs(Math.floor(duration / (end - start))));
return timer;
};
// 事例
counter('#my-id', 1, 1000, 5, 2000);
// 让 `id=“my-id”`的元素创建一个2秒计时器
189.如何将字符串复制到剪贴板?
const el = document.createElement('textarea');
el.value = str;
el.setAttribute('readonly', '');
el.style.position = 'absolute';
el.style.left = '-9999px';
document.body.appendChild(el);
const selected =
document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false;
el.select();
document.execCommand('copy');
document.body.removeChild(el);
if (selected) {
document.getSelection().removeAllRanges();
document.getSelection().addRange(selected);
}
};
// 事例
copyToClipboard('Lorem ipsum');
// 'Lorem ipsum' copied to clipboard
190.如何确定页面的浏览器选项卡是否聚焦?
const isBrowserTabFocused = () => !document.hidden;
// 事例
isBrowserTabFocused(); // true
191.如何创建目录(如果不存在)?
const fs = require('fs');
const createDirIfNotExists = dir => (!fs.existsSync(dir) ? fs.mkdirSync(dir) : undefined);
// 事例
createDirIfNotExists('test');
这里面的方法大都挺实用,可以解决很多开发过程问题,大家就好好利用起来吧。
192.日期型函数封装
function formatTime(date) {
if(!!date){
if(!(date instanceof Date))
date = new Date(date);
var month = date.getMonth() + 1
var day = date.getDate()
return `${month}月${day}日`;
}
}
function formatDay(date) {
if(!!date){
var year = date.getFullYear()
var month = date.getMonth() + 1
var day = date.getDate()
return [year, month, day].map(formatNumber).join('-');
}
}
function formatDay2(date) {
if(!!date){
var year = date.getFullYear()
var month = date.getMonth() + 1
var day = date.getDate()
return [year, month, day].map(formatNumber).join('/');
}
}
function formatWeek(date){
if(!!date){
var day = date.getDay();
switch (day) {
case 0:
return '周日'
break;
case 1:
return '周一'
break;
case 2:
return '周二'
break;
case 3:
return '周三'
break;
case 4:
return '周四'
break;
case 5:
return '周五'
break;
case 6:
return '周六'
break;
}
}
}
function formatHour(date){
if(!!date){
var hour = new Date(date).getHours();
var minute = new Date(date).getMinutes();
return [hour, minute].map(formatNumber).join(':');
}
}
function timestamp(date, divisor=1000){
if(date == undefined){
return;
}else if(typeof date == 'number'){
return Math.floor(date/divisor);
}else if(typeof date == 'string'){
var strs = date.split(/[^0-9]/);
return Math.floor(+new Date(strs[0] || 0,(strs[1] || 0)-1,strs[2] || 0,strs[3] || 0,strs[4] || 0,strs[5] || 0)/divisor);
}else if(Date.prototype.isPrototypeOf(date)){
return Math.floor(+date/divisor);
}
}
function detimestamp(date){
if(!!date){
return new Date(date*1000);
}
}
function formatNumber(n) {//给在0-9的日期加上0
n = n.toString()
return n[1] ? n : '0' + n
}
module.exports = {
formatTime: formatTime,
formatDay: formatDay,
formatDay2: formatDay2,
formatHour: formatHour,
formatWeek: formatWeek,
timestamp: timestamp,
detimestamp: detimestamp
}
193.时间戳转时间
/**
* 时间戳转化为年 月 日 时 分 秒
* number: 传入时间戳
* format:返回格式,支持自定义,但参数必须与formateArr里保持一致
*/
function formatTime(number,format) {
var formateArr = ['Y','M','D','h','m','s'];
var returnArr = [];
var date = new Date(number * 1000);
returnArr.push(date.getFullYear());
returnArr.push(formatNumber(date.getMonth() + 1));
returnArr.push(formatNumber(date.getDate()));
returnArr.push(formatNumber(date.getHours()));
returnArr.push(formatNumber(date.getMinutes()));
returnArr.push(formatNumber(date.getSeconds()));
for (var i in returnArr)
{
format = format.replace(formateArr[i], returnArr[i]);
}
return format;
}
//数据转化
function formatNumber(n) {
n = n.toString()
return n[1] ? n : '0' + n
}
调用示例:
var sjc = 1488481383;//时间戳
console.log(time.formatTime(sjc,'Y/M/D h:m:s'));//转换为日期:2017/03/03 03:03:03
console.log(time.formatTime(sjc, 'h:m'));//转换为日期:03:03
194.js中获取上下文路径
js中获取上下文路径
//js获取项目根路径,如: http://localhost:8083/uimcardprj
function getRootPath(){
//获取当前网址,如: http://localhost:8083/uimcardprj/share/meun.jsp
var curWwwPath=window.document.location.href;
//获取主机地址之后的目录,如: uimcardprj/share/meun.jsp
var pathName=window.document.location.pathname;
var pos=curWwwPath.indexOf(pathName);
//获取主机地址,如: http://localhost:8083
var localhostPaht=curWwwPath.substring(0,pos);
//获取带"/"的项目名,如:/uimcardprj
var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);
return(localhostPaht+projectName);
}
195.JS大小转化B KB MB GB的转化方法
function conver(limit){
var size = "";
if( limit < 0.1 * 1024 ){ //如果小于0.1KB转化成B
size = limit.toFixed(2) + "B";
}else if(limit < 0.1 * 1024 * 1024 ){//如果小于0.1MB转化成KB
size = (limit / 1024).toFixed(2) + "KB";
}else if(limit < 0.1 * 1024 * 1024 * 1024){ //如果小于0.1GB转化成MB
size = (limit / (1024 * 1024)).toFixed(2) + "MB";
}else{ //其他转化成GB
size = (limit / (1024 * 1024 * 1024)).toFixed(2) + "GB";
}
var sizestr = size + "";
var len = sizestr.indexOf("\.");
var dec = sizestr.substr(len + 1, 2);
if(dec == "00"){//当小数点后为00时 去掉小数部分
return sizestr.substring(0,len) + sizestr.substr(len + 3,2);
}
return sizestr;
}
196.js全屏和退出全屏
function fullScreen() {
var el = document.documentElement;
var rfs = el.requestFullScreen || el.webkitRequestFullScreen || el.mozRequestFullScreen || el.msRequestFullScreen;
? //typeof rfs != "undefined" && rfs
? if (rfs) {
? rfs.call(el);
? } else if (typeof window.ActiveXObject !== "undefined") {
? //for IE,这里其实就是模拟了按下键盘的F11,使浏览器全屏
? var wscript = new ActiveXObject("WScript.Shell");
? if (wscript != null) {
? wscript.SendKeys("{F11}");
? }
? }
? }
? //退出全屏
? function exitScreen() {
? var el = document;
? var cfs = el.cancelFullScreen || el.webkitCancelFullScreen || el.mozCancelFullScreen || el.exitFullScreen;
? //typeof cfs != "undefined" && cfs
? if (cfs) {
? cfs.call(el);
? } else if (typeof window.ActiveXObject !== "undefined") {
? //for IE,这里和fullScreen相同,模拟按下F11键退出全屏
? var wscript = new ActiveXObject("WScript.Shell");
? if (wscript != null) {
? wscript.SendKeys("{F11}");
? }
? }
? }
197.格式化时间,转化为几分钟前,几秒钟前
/**
* 格式化时间,转化为几分钟前,几秒钟前
* @param timestamp 时间戳,单位是毫秒
*/
function timeFormat(timestamp) {
var mistiming = Math.round((Date.now() - timestamp) / 1000);
var arrr = ['年', '个月', '星期', '天', '小时', '分钟', '秒'];
var arrn = [31536000, 2592000, 604800, 86400, 3600, 60, 1];
for (var i = 0; i < arrn.length; i++) {
var inm = Math.floor(mistiming / arrn[i]);
if (inm != 0) {
return inm + arrr[i] + '前';
}
}
}
198 获取n天之前的日期 getDaysBeforeDate(10) 10天前
/**
* 获取n天之前的日期 getDaysBeforeDate(10) 10天前
* @param day 天数
*/
function getDaysBeforeDate(day) {
var date = new Date(),
timestamp, newDate;
timestamp = date.getTime();
// 获取三天前的日期
newDate = new Date(timestamp - day * 24 * 3600 * 1000);
var year = newDate.getFullYear();
// 月+1是因为js中月份是按0开始的
var month = newDate.getMonth() + 1;
var day = newDate.getDate();
if (day < 10) { // 如果日小于10,前面拼接0
day = '0' + day;
}
if (month < 10) { // 如果月小于10,前面拼接0
month = '0' + month;
}
return [year, month, day].join('/');
}
199.获取跳转的classId,通过hash方式获取
/**
* 获取跳转的classId,通过hash方式获取
* @return 返回值
*/
$scope.getQueryString = function() {
var url= {},
a = '';
(a = window.location.search.substr(1)) || (a = window.location.hash.split('?')[1])
a.split(/&/g).forEach(function(item) {
url[(item = item.split('='))[0]] = item[1];
})
return url
}
200.过滤器指定字段
function filterArrBySex(data, name) {
if (!name) {
console.log(name)
return data;
} else {
return data.filter(function(ele, index, self) {
if (ele.name.includes(name)) {
return ele
}
})
}
}
201.根据身份证获取出生年月
/**
* 根据身份证获取出生年月
* @param idCard
*/
function getBirthdayFromIdCard(idCard) {
var birthday = "";
if (idCard != null && idCard != "") {
if (idCard.length == 15) {
birthday = "19" + idCard.substr(6, 6);
} else if (idCard.length == 18) {
birthday = idCard.substr(6, 8);
}
birthday = birthday.replace(/(.{4})(.{2})/, "$1-$2-");
}
return birthday;
}
202.根据身份证获取年龄
/**
* 根据身份证获取年龄
* @param UUserCard
*/
function IdCard(UUserCard) {
//获取年龄
var myDate = new Date();
var month = myDate.getMonth() + 1;
var day = myDate.getDate();
var age = myDate.getFullYear() - UUserCard.substring(6, 10) - 1;
if (UUserCard.substring(10, 12) < month || UUserCard.substring(10, 12) == month && UUserCard.substring(12, 14) <= day) {
age++;
}
return age
}
//vue购物车金额结算
window.onload = function() {
var vm = new Vue({
el: '#app',
data: {
items: [{
id: 1,
name: "苹果",
price: 10,
count: 1,
url: "http://www.jq22.com/img/cs/500x500-1.png"
},
{
id: 2,
name: "蝴蝶",
price: 8,
count: 5,
url: "http://www.jq22.com/img/cs/500x500-2.png"
},
{
id: 3,
name: "小狗",
price: 100,
count: 1,
url: "http://www.jq22.com/img/cs/500x500-3.png"
},
{
id: 4,
name: "鲜花",
price: 10,
count: 1,
url: "http://www.jq22.com/img/cs/500x500-4.png"
}
],
search: ""
},
methods: {
},
filters: { //过滤器
numFilter: function(data, n) { //data==item.price 当前过滤的数据 n==2
return "¥" + data.toFixed(n)
}
},
computed: { //计算属性
totalCount: function() {
var n = 0;
this.items.forEach((v, i) => {
n += v.count
});
return n;
},
totalPrice: function() {
var money = 0;
this.items.forEach((v, i) => {
money += v.count * v.price
});
return money;
},
searchFor: function() {
if (!this.search) {
return this.items
}
return this.items.filter((v, i) => {
if (v.name.indexOf(this.search) !== -1) { //匹配成功
return v
}
})
}
}
})
}
//设置iframe高度
function setIframeHeight(sonH) { //debugger;
var height = 0;
//比较父子页面高度,以高度更大的为准
var parentH = $(window).height(); //iframe最小高度应为浏览器视口高度,否则门户管理页面弹窗大小会受限制
height = parentH > sonH ? parentH : sonH;
$('#mainIframe').height(height);
//子页面有传值过来,覆盖iframe的最小高度-2000px
$("#mainIframe").css("min-height", 'auto');
$(".body-bg").css("height", height + 200);
try {
var childBody = $("#mainIframe")[0].contentWindow.document.getElementsByTagName("body")[0];
//childBody.style.minHeight = height + "px";
} catch (error) {
if (error.message.indexOf("Blocked from frame") > -1) console.warn("当前页面存在跨域!");
}
}
(function($) {
$("#username").keyup(function(event) {
if (event.keyCode == 13) $("#password").focus().select();
});
$("#password").keyup(function(event) {
if (event.keyCode == 13) $("#login-button").click();
});
})(jQuery);
//回到顶部
function goTop() {
window.scrollTo({
top: 0,
behavior: 'smooth',
});
}
window.onscroll = function() {
var t = document.documentElement.scrollTop;
if (t > 50) {
$(".toTop").fadeIn();
} else {
$(".toTop").fadeOut();
}
}
function urlAnalysis() {
var url = window.location.href;
var paraString = url.substring(url.indexOf("?") + 1, url.length);
var indexFirst = paraString.indexOf("&");
var paraStringTitle = paraString.slice(0, indexFirst);
paraStringElse = paraString.slice(indexFirst + 1, paraString.length);
var paraStringUrl = paraStringElse;
//区分是否传参:functionId
if (paraString.indexOf("functionId") > -1) {
var indexSecond = paraStringElse.indexOf("&");
var paraStringFId = paraStringElse.slice(0, indexSecond);
var functionId = paraStringFId.split("=")[1];
var $body = angular.element(document.body);
var $rootScope = $body.scope().$root;
$rootScope.navFunctionId = functionId;
paraStringUrl = paraStringElse.slice(indexSecond + 1, paraStringElse.length);
}
var title = paraStringTitle.split("=")[1] === "undefined" ? "" : decodeURI(paraStringTitle.split("=")[1]);
var indexUrl = paraStringUrl.indexOf("=");
var iframeUrl = paraStringUrl.slice(indexUrl + 1, paraStringUrl.length);
document.title = title;
$("#mainIframe").attr("src", iframeUrl);
}
// 监听enter按下事件,页面跳转
$scope.enterEvent = function(e) {
var keycode = window.event ? e.keyCode : e.which;
if (keycode == 13) {
console.log($scope.searchVal)
console.log('监听成功')
var baseUrl = '#/pages/knowlege/knowlegeSeach.html'
window.open(baseUrl)
}
};
function showDate() {
var myDate = new Date();
var year = myDate.getFullYear();
var month = myDate.getMonth() + 1;
month = month < 10 ? '0' + month : month;
var date = myDate.getDate();
date = date < 10 ? '0' + date : date;
var weekDay = myDate.getDay();
switch (weekDay) {
case 0:
weekDay = "天";
break;
case 1:
weekDay = "一";
break;
case 2:
weekDay = "二";
break;
case 3:
weekDay = "三";
break;
case 4:
weekDay = "四";
break;
case 5:
weekDay = "五";
break;
case 6:
weekDay = "六";
break;
"name"
}
$scope.year = year;
$scope.month = month;
$scope.date = date;
$scope.weekDay = weekDay;
}
//获取跳转的classId,通过hash方式获取
$scope.getQueryString = function() {
var obg = {},
a = '';
(a = window.location.search.substr(1)) || (a = window.location.hash.split('?')[1])
a.split(/&/g).forEach(function(item) {
obg[(item = item.split('='))[0]] = item[1];
})
return obg
}
var classId = $scope.getQueryString();
203.原生js滑块验证
//event.clientX:鼠标点下的点到左侧x轴的距离
window.onload = function() {
//事件处理 onmousedown onmousemove onmouseup
var box = document.querySelector(".box")
var btn = document.querySelector(".btn")
var bg = document.querySelector(".bg")
var text1 = document.querySelector(".text")
//封装的选择器 声明式函数可以提升
// function fun(){
//
// }
var flag = false; //标记
btn.onmousedown = function(event) {
var downx = event.clientX; //按下后获取的与x轴的距离
btn.onmousemove = function(e) {
var movex = e.clientX - downx; //滑块滑动的距离
//移动的范围
if (movex > 0) {
this.style.left = movex + "px";
bg.style.width = movex + "px";
if (movex >= box.offsetWidth - 40) {
//验证成功
flag = true
text1.innerHTML = "验证成功"
text1.style.color = "#fff"
//清除事件
btn.onmousedown = null;
btn.onmousemove = null;
}
}
}
}
//松开事件
btn.onmouseup = function() {
//清除事件
btn.onmousemove = null;
if (flag) return;
this.style.left = 0;
bg.style.width = 0 + "px";
}
}
204.纯 js无限加载瀑布(原创)
//随机[m,n]之间的整数 封装
function randomNumber(m, n) {
return Math.floor(Math.random() * (n - m + 1) + m);
}
//随机颜色 封装
function randomColor() {
return "rgb(" + randomNumber(0, 255) + "," + randomNumber(0, 255) + "," + randomNumber(0, 255) + ")";
}
//获取当前的scrollTop
var scrollTopDistance;
//获取所有的ul
var uls = document.querySelectorAll("ul");
var i = 0;
var k = i;
function waterFall() {
for (i = k; i < k + 4; i++) {
//创建li
var li = document.createElement("li");
//随机颜色
li.style.backgroundColor = randomColor();
//随机高度
li.style.height = randomNumber(120, 400) + "px";
//手动转换为字符串
li.innerHTML = i + 1 + "";
//插入到对应的ul中
//判断哪个ul的高度低,该次创建的li就插入到此ul中
var index = 0; //记录下标
for (var j = 0; j < uls.length; j++) {
if (uls[j].offsetHeight < uls[index].offsetHeight) {
index = j;
}
}
//将元素节点插入文档中
uls[index].appendChild(li);
}
k = i;
return uls[index].offsetHeight;
}
waterFall();
//鼠标滚轮事件,由于右侧没有滚轮,所以使用onmousewheel事件
window.onmousewheel = function() {
//获取窗口的高度,要兼容浏览器
var windowH = document.documentElement.clientHeight;
//滚轮于top的距离,要兼容浏览器
var scrollH = document.documentElement.scrollTop ||
document.body.scrollTop;
//获取窗口的可见高度
var documentH = document.documentElement.scrollHeight ||
document.body.scrollHeight;
//窗口的高度 + 滚轮与顶部的距离 > 窗口的可见高度-200
if (windowH + scrollH > documentH - 200) {
//执行此函数
waterFall()
}
}
205.jQuery两个元素比较高度
$(*function* () {
*var* w_max = 0;
*//求最大高度*
$("#MenuNavigation li").each(*function* () {
? *var* w = $(*this*).innerWidth();
? w_max = w > w_max ? w : w_max;
})
$("#MenuNavigation li").width(w_max)
*//将最大高度赋值给所有元素,*
})
206.js定时清除缓存,存储缓存,获取缓存
// 封装本地存储的方法
export const storage = {
set: function(variable, value, ttl_ms) {
var data = { value: value, expires_at: new Date(ttl_ms).getTime() };
localStorage.setItem(variable.toString(), JSON.stringify(data));
},
get: function(variable) {
var data = JSON.parse(localStorage.getItem(variable.toString()));
if (data !== null) {
debugger
if (data.expires_at !== null && data.expires_at < new Date().getTime()) {
localStorage.removeItem(variable.toString());
} else {
return data.value;
}
}
return null;
},
remove(key) {
localStorage.removeItem(key);
}
}
207.数组降维
//数组降维
reduceDimension(arr) {
var reduced = [];
for (var i = 0; i < arr.length; i++) {
reduced = reduced.concat(arr[i]);
}
return reduced;
}
208.设置cookie,获取cookie,删除cookie
var cookieUtil = {
getCookie: function (name) {
var arrCookie = document.cookie.split("; ");
for (var i = 0; i < arrCookie.length; i++) {
var cookieItem = arrCookie[i].split('=');
if (cookieItem[0] == name) {
return cookieItem[1];
}
}
return undefined;
},
setCookie: function (name, value, expires, path, domain, secure) {
var cookieText = encodeURIComponent(name) + "=" +
encodeURIComponent(value);
if (expires instanceof Date) {
cookieText += "; expires=" + expires.toGMTString();
}
if (path) {
cookieText += "; path=" + path;
}
if (domain) {
cookieText += "; domain=" + domain;
}
if (secure) {
cookieText += "; secure";
}
document.cookie = cookieText;
},
removeCookie: function (name, path, domain, secure) {
this.set(name, "", new Date(0), path, domain, secure);
}
}
209.判读是否为外链
/**
* @description 判读是否为外链
* @param path
* @returns {boolean}
*/
export function isExternal(path) {
return /^(https?:|mailto:|tel:)/.test(path);
}
210.校验密码是否小于6位
/**
* @description 校验密码是否小于6位
* @param str
* @returns {boolean}
*/
export function isPassword(str) {
return str.length >= 6;
}
211.判断是否为数字
/**
* @description 判断是否为数字
* @param value
* @returns {boolean}
*/
export function isNumber(value) {
const reg = /^[0-9]*$/;
return reg.test(value);
}
212.判断是否是名称
/**
* @description 判断是否是名称
* @param value
* @returns {boolean}
*/
export function isName(value) {
const reg = /^[\u4e00-\u9fa5a-zA-Z0-9]+$/;
return reg.test(value);
}
213.判断是否为IP
/**
* @description 判断是否为IP
* @param ip
* @returns {boolean}
*/
export function isIP(ip) {
const reg = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;
return reg.test(ip);
}
214.判断是否是传统网站
/**
* @description 判断是否是传统网站
* @param url
* @returns {boolean}
*/
export function isUrl(url) {
const reg = /^(https?|ftp):\/\/([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){3}|([a-zA-Z0-9-]+\.)*[a-zA-Z0-9-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(:[0-9]+)*(\/($|[a-zA-Z0-9.,?'\\+&%$#=~_-]+))*$/;
return reg.test(url);
}
215.判断是否是小写字母
/**
* @description 判断是否是小写字母
* @param str
* @returns {boolean}
*/
export function isLowerCase(str) {
const reg = /^[a-z]+$/;
return reg.test(str);
}
216.判断是否是大写字母
/**
* @description 判断是否是大写字母
* @param str
* @returns {boolean}
*/
export function isUpperCase(str) {
const reg = /^[A-Z]+$/;
return reg.test(str);
}
217.判断是否是大写字母开头
/**
* @description 判断是否是大写字母开头
* @param str
* @returns {boolean}
*/
export function isAlphabets(str) {
const reg = /^[A-Za-z]+$/;
return reg.test(str);
}
218.判断是否是字符串
/**
* @description 判断是否是字符串
* @param str
* @returns {boolean}
*/
export function isString(str) {
return typeof str === "string" || str instanceof String;
}
219.判断是否是数组
/**
* @description 判断是否是数组
* @param arg
* @returns {arg is any[]|boolean}
*/
export function isArray(arg) {
if (typeof Array.isArray === "undefined") {
return Object.prototype.toString.call(arg) === "[object Array]";
}
return Array.isArray(arg);
}
220.判断是否是端口号
/**
* @description 判断是否是端口号
* @param str
* @returns {boolean}
*/
export function isPort(str) {
const reg = /^([0-9]|[1-9]\d|[1-9]\d{2}|[1-9]\d{3}|[1-5]\d{4}|6[0-4]\d{3}|65[0-4]\d{2}|655[0-2]\d|6553[0-5])$/;
return reg.test(str);
}
221.判断是否是手机号
/**
* @description 判断是否是手机号
* @param str
* @returns {boolean}
*/
export function isPhone(str) {
const reg = /^1\d{10}$/;
return reg.test(str);
}
222.判断是否是身份证号(第二代)
/**
* @description 判断是否是身份证号(第二代)
* @param str
* @returns {boolean}
*/
export function isIdCard(str) {
const reg = /^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;
return reg.test(str);
}
223.判断是否是邮箱
/**
* @description 判断是否是邮箱
* @param str
* @returns {boolean}
*/
export function isEmail(str) {
const reg = /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;
return reg.test(str);
}
224.判断是否中文
/**
* @description 判断是否中文
* @param str
* @returns {boolean}
*/
export function isChina(str) {
const reg = /^[\u4E00-\u9FA5]{2,4}$/;
return reg.test(str);
}
225.判断是否为空
/**
* @description 判断是否为空
* @param str
* @returns {boolean}
*/
export function isBlank(str) {
return (
str == null ||
false ||
str === "" ||
str.trim() === "" ||
str.toLocaleLowerCase().trim() === "null"
);
}
226.判断是否为固话
/**
* @description 判断是否为固话
* @param str
* @returns {boolean}
*/
export function isTel(str) {
const reg = /^(400|800)([0-9\\-]{7,10})|(([0-9]{4}|[0-9]{3})(-| )?)?([0-9]{7,8})((-| |转)*([0-9]{1,4}))?$/;
return reg.test(str);
}
227.判断是否为数字且最多两位小数
/**
* @description 判断是否为数字且最多两位小数
* @param str
* @returns {boolean}
*/
export function isNum(str) {
const reg = /^\d+(\.\d{1,2})?$/;
return reg.test(str);
}
228.判断经度 -180.0~+180.0(整数部分为0~180,必须输入1到5位小数)
/**
* @description 判断经度 -180.0~+180.0(整数部分为0~180,必须输入1到5位小数)
* @param str
* @returns {boolean}
*/
export function isLongitude(str) {
const reg = /^[-|+]?(0?\d{1,2}\.\d{1,5}|1[0-7]?\d{1}\.\d{1,5}|180\.0{1,5})$/;
return reg.test(str);
}
229.判断纬度 -90.0~+90.0(整数部分为0~90,必须输入1到5位小数)
/**
* @description 判断纬度 -90.0~+90.0(整数部分为0~90,必须输入1到5位小数)
* @param str
* @returns {boolean}
*/
export function isLatitude(str) {
const reg = /^[-|+]?([0-8]?\d{1}\.\d{1,5}|90\.0{1,5})$/;
return reg.test(str);
}
230.rtsp校验只要有rtsp://
/**
* @description rtsp校验,只要有rtsp://
* @param str
* @returns {boolean}
*/
export function isRTSP(str) {
const reg = /^rtsp:\/\/([a-z]{0,10}:.{0,10}@)?(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;
const reg1 = /^rtsp:\/\/([a-z]{0,10}:.{0,10}@)?(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5]):[0-9]{1,5}/;
const reg2 = /^rtsp:\/\/([a-z]{0,10}:.{0,10}@)?(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\//;
return reg.test(str) || reg1.test(str) || reg2.test(str);
}
231.判断IE浏览器版本和检测是否为非IE浏览器
function IEVersion() {
var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器
var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器
var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;
if (isIE) {
var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
reIE.test(userAgent);
var fIEVersion = parseFloat(RegExp["$1"]);
if (fIEVersion == 7) {
return 7;
} else if (fIEVersion == 8) {
return 8;
} else if (fIEVersion == 9) {
return 9;
} else if (fIEVersion == 10) {
return 10;
} else {
return 6; //IE版本<=7
}
} else if (isEdge) {
return 'edge'; //edge
} else if (isIE11) {
return 11; //IE11
} else {
return -1; //不是ie浏览器
}
}
232.数组去重
方案一:Set + ...
function noRepeat(arr) {
return [...new Set(arr)];
}
noRepeat([1,2,3,1,2,3])
方案二:Set + Array.from
function noRepeat(arr) {
return Array.from(new Set(arr));
}
noRepeat([1,2,3,1,2,3])
方案三:双重遍历比对下标
function noRepeat(arr) {
return arr.filter((v, idx)=>idx == arr.lastIndexOf(v))
}
noRepeat([1,2,3,1,2,3])
方案四:单遍历 + Object 特性
Object 的特性是 Key 不会重复。
这里使用 values 是因为可以保留类型,keys 会变成字符串。
function noRepeat(arr) {
return Object.values(arr.reduce((s,n)=>{
s[n] = n;
return s
},{}))
}
noRepeat([1,2,3,1,2,3])
后记
针对于上述的方案,还有其他变种实现。
233.查找数组最大
方案一:Math.max + ...
function arrayMax(arr) {
return Math.max(...arr);
}
arrayMax([-1,-4,5,2,0])
方案二:Math.max + apply
function arrayMax(arr) {
return Math.max.apply(Math, arr)
}
arrayMax([-1,-4,5,2,0])
方案三:Math.max + 遍历
function arrayMax(arr) {
return arr.reduce((s,n)=>Math.max(s, n))
}
arrayMax([-1,-4,5,2,0])
方案四:比较、条件运算法 + 遍历
function arrayMax(arr) {
return arr.reduce((s,n)=>s>n?s:n)
}
arrayMax([-1,-4,5,2,0])
方案五:排序
function arrayMax(arr) {
return arr.sort((n,m)=>m-n)[0]
}
arrayMax([-1,-4,5,2,0])
234.查找数组最小
同上,不明白为什么要分成两个题目。
Math.max 换成 Math.min
s>n?s:n 换成 `s
(n,m)=>m-n 换成 (n,m)=>n-m,或者直接取最后一个元素
235.返回已 size 为长度的数组分割的原数组
方案一:Array.from + slice
function chunk(arr, size = 1) {
return Array.from(
{
length: Math.ceil(arr.length / size),
},
(v, i) => arr.slice(i * size, i * size + size)
);
}
chunk([1,2,3,4,5,6,7,8],3)
方案二:Array.from + splice
function chunk(arr, size = 1) {
return Array.from(
{
length: Math.ceil(arr.length / size),
},
(v, i) => arr.splice(0, size)
);
}
chunk([1,2,3,4,5,6,7,8],3)
方案三:遍历 + splice
function chunk(arr, size = 1) {
var _returnArr = [];
while(arr.length){
_returnArr.push(arr.splice(0, size))
}
return _returnArr
}
chunk([1,2,3,4,5,6,7,8],3)
检查数组中某元素出现的次数
方案一:reduce
function countOccurrences(arr, value) {
return arr.reduce((a, v) => (v === value ? a + 1 : a + 0), 0);
}
countOccurrences([1,2,3,4,5,1,2,1,2,3], 1)
方案二:filter
function countOccurrences(arr, value) {
return arr.filter(v=>v===value).length
}
countOccurrences([1,2,3,4,5,1,2,1,2,3], 1)
236.扁平化数组
方案一:递归 + ...
function flatten(arr, depth = -1) {
if (depth === -1) {
return [].concat(
...arr.map((v) => (Array.isArray(v) ? this.flatten(v) : v))
);
}
if (depth === 1) {
return arr.reduce((a, v) => a.concat(v), []);
}
return arr.reduce(
(a, v) => a.concat(Array.isArray(v) ? this.flatten(v, depth - 1) : v),
[]
);
}
flatten([1,[2,[3]]])
方案二:es6 原生 flat
function flatten(arr, depth = Infinity) {
return arr.flat(depth)
}
flatten([1,[2,[3]]])
对比两个数组并且返回其中不同的元素
方案一:filter + includes
他原文有问题,以下方法的 4,5 没有返回
function diffrence(arrA, arrB) {
return arrA.filter((v) => !arrB.includes(v));
}
diffrence([1,2,3], [3,4,5,2])
需要再操作一遍
function diffrence(arrA, arrB) {
return arrA.filter((v) => !arrB.includes(v))
.concat(arrB.filter((v) => !arrA.includes(v)));
}
diffrence([1,2,3], [3,4,5,2])
方案二:hash + 遍历
算是方案1的变种吧,优化了 includes 的性能。
237.返回两个数组中相同的元素
方案一:filter + includes
function intersection(arr1, arr2) {
return arr2.filter((v) => arr1.includes(v));
}
intersection([1,2,3], [3,4,5,2])
方案二:同理变种用 hash
function intersection(arr1, arr2) {
var set = new Set(arr2)
return arr1.filter((v) => set.has(v));
}
intersection([1,2,3], [3,4,5,2])
238.从右删除 n 个元素
方案一:slice
function dropRight(arr, n = 0) {
return n < arr.length ? arr.slice(0, arr.length - n) : [];
}
dropRight([1,2,3,4,5], 2)
方案二: splice
function dropRight(arr, n = 0) {
return arr.splice(0, arr.length - n)
}
dropRight([1,2,3,4,5], 2)
方案三: slice 另一种
function dropRight(arr, n = 0) {
return arr.slice(0, -n)
}
dropRight([1,2,3,4,5], 2)
方案四: 修改 length
function dropRight(arr, n = 0) {
arr.length = Math.max(arr.length - n, 0)
return arr
}
dropRight([1,2,3,4,5], 2)
239.截取第一个符合条件的元素及其以后的元素
方案一:slice + 循环
function dropElements(arr, fn) {
while (arr.length && !fn(arr[0])) arr = arr.slice(1);
return arr;
}
dropElements([1,2,3,4,5,1,2,3], (v) => v == 2)
方案二:findIndex + slice
function dropElements(arr, fn) {
return arr.slice(Math.max(arr.findIndex(fn), 0));
}
dropElements([1,2,3,4,5,1,2,3], (v) => v === 3)
方案三:splice + 循环
function dropElements(arr, fn) {
while (arr.length && !fn(arr[0])) arr.splice(0,1);
return arr;
}
dropElements([1,2,3,4,5,1,2,3], (v) => v == 2)
240.返回数组中下标间隔 nth 的元素
方案一:filter
function everyNth(arr, nth) {
return arr.filter((v, i) => i % nth === nth - 1);
}
everyNth([1,2,3,4,5,6,7,8], 2)
方案二:方案一修改判断条件
function everyNth(arr, nth) {
return arr.filter((v, i) => (i+1) % nth === 0);
}
everyNth([1,2,3,4,5,6,7,8], 2)
241.返回数组中第 n 个元素(支持负数)
方案一:slice
function nthElement(arr, n = 0) {
return (n >= 0 ? arr.slice(n, n + 1) : arr.slice(n))[0];
}
nthElement([1,2,3,4,5], 0)
nthElement([1,2,3,4,5], -1)
方案二:三目运算符
function nthElement(arr, n = 0) {
return (n >= 0 ? arr[0] : arr[arr.length + n])
}
nthElement([1,2,3,4,5], 0)
nthElement([1,2,3,4,5], -1)
242.返回数组头元素
方案一:
function head(arr) {
return arr[0];
}
head([1,2,3,4])
方案二:
function head(arr) {
return arr.slice(0,1)[0];
}
head([1,2,3,4])
243.返回数组末尾元素
方案一:
function last(arr) {
return arr[arr.length - 1];
}
方案二:
function last(arr) {
return arr.slice(-1)[0];
}
last([1,2,3,4,5])
245.数组乱排
方案一:洗牌算法
function shuffle(arr) {
let array = arr;
let index = array.length;
while (index) {
index -= 1;
let randomInedx = Math.floor(Math.random() * index);
let middleware = array[index];
array[index] = array[randomInedx];
array[randomInedx] = middleware;
}
return array;
}
shuffle([1,2,3,4,5])
方案二:sort + random
function shuffle(arr) {
return arr.sort((n,m)=>Math.random() - .5)
}
shuffle([1,2,3,4,5])
246.伪数组转换为数组
方案一:Array.from
Array.from({length: 2})
方案二:prototype.slice
Array.prototype.slice.call({length: 2,1:1})
方案三:prototype.splice
Array.prototype.splice.call({length: 2,1:1},0)
浏览器对象 BOM
195.判读浏览器是否支持 CSS 属性
function validateCssKey(key) {
const jsKey = toCamelCase(key);
if (jsKey in document.documentElement.style) {
return key;
}
let validKey = "";
const prefixMap = {
Webkit: "-webkit-",
Moz: "-moz-",
ms: "-ms-",
O: "-o-",
};
for (const jsPrefix in prefixMap) {
const styleKey = toCamelCase(`${jsPrefix}-${jsKey}`);
if (styleKey in document.documentElement.style) {
validKey = prefixMap[jsPrefix] + key;
break;
}
}
return validKey;
}
function toCamelCase(value) {
return value.replace(/-(\w)/g, (matched, letter) => {
return letter.toUpperCase();
});
}
function valiateCssValue(key, value) {
const prefix = ["-o-", "-ms-", "-moz-", "-webkit-", ""];
const prefixValue = prefix.map((item) => {
return item + value;
});
const element = document.createElement("div");
const eleStyle = element.style;
prefixValue.forEach((item) => {
eleStyle[key] = item;
});
return eleStyle[key];
}
function valiateCssValue(key, value) {
var prefix = ["-o-", "-ms-", "-moz-", "-webkit-", ""];
var prefixValue = [];
for (var i = 0; i < prefix.length; i++) {
prefixValue.push(prefix[i] + value);
}
var element = document.createElement("div");
var eleStyle = element.style;
for (var j = 0; j < prefixValue.length; j++) {
eleStyle[key] = prefixValue[j];
}
return eleStyle[key];
}
function validCss(key, value) {
const validCss = validateCssKey(key);
if (validCss) {
return validCss;
}
return valiateCssValue(key, value);
}
segmentfault.com/a/11...
它里面有 forEach。
247.返回当前网页地址
方案一:location
function currentURL() {
return window.location.href;
}
currentURL()
方案二:a 标签
function currentURL() {
var el = document.createElement('a')
el.href = ''
return el.href
}
currentURL()
获取滚动条位置
function getScrollPosition(el = window) {
return {
x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop,
};
}
248.获取 url 中的参数
方案一:正则 + reduce
function getURLParameters(url) {
return url
.match(/([^?=&]+)(=([^&]*))/g)
.reduce(
(a, v) => (
(a[v.slice(0, v.indexOf("="))] = v.slice(v.indexOf("=") + 1)), a
),
{}
);
}
getURLParameters(location.href)
方案二:split + reduce
function getURLParameters(url) {
return url
.split('?')
.slice(1)
.join()
.split('&')
.map(v=>v.split('='))
.reduce((s,n)=>{s[n[0]] = n[1];return s},{})
}
getURLParameters(location.href)
方案三: URLSearchParams
249.页面跳转,是否记录在 history 中
方案一:
function redirect(url, asLink = true) {
asLink ? (window.location.href = url) : window.location.replace(url);
}
方案二:
function redirect(url, asLink = true) {
asLink ? window.location.assign(url) : window.location.replace(url);
}
250.滚动条回到顶部动画
方案一: c - c / 8
c 没有定义
function scrollToTop() {
const scrollTop =
document.documentElement.scrollTop || document.body.scrollTop;
if (scrollTop > 0) {
window.requestAnimationFrame(scrollToTop);
window.scrollTo(0, c - c / 8);
} else {
window.cancelAnimationFrame(scrollToTop);
}
}
scrollToTop()
修正之后
function scrollToTop() {
const scrollTop =
document.documentElement.scrollTop || document.body.scrollTop;
if (scrollTop > 0) {
window.requestAnimationFrame(scrollToTop);
window.scrollTo(0, scrollTop - scrollTop / 8);
} else {
window.cancelAnimationFrame(scrollToTop);
}
}
scrollToTop()
251.复制文本
方案一:
function copy(str) {
const el = document.createElement("textarea");
el.value = str;
el.setAttribute("readonly", "");
el.style.position = "absolute";
el.style.left = "-9999px";
el.style.top = "-9999px";
document.body.appendChild(el);
const selected =
document.getSelection().rangeCount > 0
? document.getSelection().getRangeAt(0)
: false;
el.select();
document.execCommand("copy");
document.body.removeChild(el);
if (selected) {
document.getSelection().removeAllRanges();
document.getSelection().addRange(selected);
}
}
方案二:cliboard.js
252.检测设备类型
方案一: ua
function detectDeviceType() {
return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(
navigator.userAgent
)
? "Mobile"
: "Desktop";
}
detectDeviceType()
方案二:事件属性
function detectDeviceType() {
return ("ontouchstart" in window || navigator.msMaxTouchPoints)
? "Mobile"
: "Desktop";
}
detectDeviceType()
253.Cookie
增
function setCookie(key, value, expiredays) {
var exdate = new Date();
exdate.setDate(exdate.getDate() + expiredays);
document.cookie =
key +
"=" +
escape(value) +
(expiredays == null ? "" : ";expires=" + exdate.toGMTString());
}
删
function delCookie(name) {
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval = getCookie(name);
if (cval != null) {
document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}
}
查
function getCookie(name) {
var arr,
reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
if ((arr = document.cookie.match(reg))) {
return arr[2];
} else {
return null;
}
}
清空
有时候我们想清空,但是又无法获取到所有的cookie。
这个时候我们可以了利用写满,然后再清空的办法。
日期 Date
254.时间戳转换为时间
默认为当前时间转换结果
isMs 为时间戳是否为毫秒
function timestampToTime(timestamp = Date.parse(new Date()), isMs = true) {
const date = new Date(timestamp * (isMs ? 1 : 1000));
return `${date.getFullYear()}-${
date.getMonth() + 1 < 10 ? "0" + (date.getMonth() + 1) : date.getMonth() + 1
}-${date.getDate()} ${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`;
}
255固定滚动条
let scrollTop = 0;
function preventScroll() {
scrollTop = window.scrollY;
document.body.style["overflow-y"] = "hidden";
document.body.style.position = "fixed";
document.body.style.width = "100%";
document.body.style.top = -scrollTop + "px";
}
function recoverScroll() {
document.body.style["overflow-y"] = "auto";
document.body.style.position = "static";
window.scrollTo(0, scrollTop);
}
256 判断当前位置是否为页面底部
返回值为 true/false
function bottomVisible() {
return (
document.documentElement.clientHeight + window.scrollY >=
(document.documentElement.scrollHeight ||
document.documentElement.clientHeight)
);
}
257判断元素是否在可视范围内
partiallyVisible 为是否为完全可见
function elementIsVisibleInViewport(el, partiallyVisible = false) {
const { top, left, bottom, right } = el.getBoundingClientRect();
return partiallyVisible
? ((top > 0 && top < innerHeight) ||
(bottom > 0 && bottom < innerHeight)) &&
((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth))
: top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;
}
258.获取元素 css 样式
function getStyle(el, ruleName) {
return getComputedStyle(el, null).getPropertyValue(ruleName);
}
259.进入全屏
function launchFullscreen(element) {
if (element.requestFullscreen) {
element.requestFullscreen();
} else if (element.mozRequestFullScreen) {
element.mozRequestFullScreen();
} else if (element.msRequestFullscreen) {
element.msRequestFullscreen();
} else if (element.webkitRequestFullscreen) {
element.webkitRequestFullScreen();
}
}
launchFullscreen(document.documentElement);
launchFullscreen(document.getElementById("id"));
260退出全屏
function exitFullscreen() {
if (document.exitFullscreen) {
document.exitFullscreen();
} else if (document.msExitFullscreen) {
document.msExitFullscreen();
} else if (document.mozCancelFullScreen) {
document.mozCancelFullScreen();
} else if (document.webkitExitFullscreen) {
document.webkitExitFullscreen();
}
}
exitFullscreen();
261全屏事件
document.addEventListener("fullscreenchange", function (e) {
if (document.fullscreenElement) {
console.log("进入全屏");
} else {
console.log("退出全屏");
}
});
数字 Number
262.数字千分位分割
function commafy(num) {
return num.toString().indexOf(".") !== -1
? num.toLocaleString()
: num.toString().replace(/(\d)(?=(?:\d{3})+$)/g, "$1,");
}
commafy(1000)
263.生成随机数
function randomNum(min, max) {
switch (arguments.length) {
case 1:
return parseInt(Math.random() * min + 1, 10);
case 2:
return parseInt(Math.random() * (max - min + 1) + min, 10);
default:
return 0;
}
}
randomNum(1,10)
264 时间戳转时间
function timestampToTime(cjsj) {
var date = new Date(cjsj);
var Y = date.getFullYear() + '-';
var M = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-';
var D = (date.getDate() + 1 < 10 ? '0' + (date.getDate()) : date.getDate()) + ' ';
return Y + M + D
}
265 过滤富文本和空格为纯文本
function filterHtml(str) {
return str.replace(/<[^<>]+>/g, '').replace(/ /ig, '');
}
266 指定显示的文字数量多余的使用省略号代替
function strEllp(str, num = str.length) {
var subStr = str.substring(0, num);
return subStr + (str.length > num ? '...' : '');
}
267 获取滚动条当前的位置
function getScrollTop() {
var scrollTop = 0
if (document.documentElement && document.documentElement.scrollTop) {
scrollTop = document.documentElement.scrollTop;
} else if (document.body) {
scrollTop = document.body.scrollTop;
}
return scrollTop
}
268 获取当前可视范围的高度
function getClientHeight() {
var clientHeight = 0
if (document.body.clientHeight && document.documentElement.clientHeight) {
clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight)
} else {
clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight)
}
return clientHeight
}
269 获取文档完整的高度
function getScrollHeight() {
return Math.max(document.body.scrollHeight, document.documentElement.scrollHeight)
}