1.Js天数相加获取新日期
function timestampToTime(timestamp) {
var date = new Date(timestamp);//时间戳为10位需*1000，时间戳为13位的话不需乘1000
var Y = date.getFullYear();
var M = (date.getMonth()+1 < 10 ? '0'+(date.getMonth()+1):date.getMonth()+1);
var D = (date.getDate()< 10 ? '0'+date.getDate():date.getDate());
return Y+"年"+M+"月"+D+"日";
}
实用方法:
2.获取当前日期(yyyyMMdd格式)
function getNowFormatDate() {
var date = new Date();
var year = date.getFullYear();
var month = date.getMonth() + 1;
var strDate = date.getDate();
if (month >= 1 && month <= 9) {
month = "0" + month;
}
if (strDate >= 0 && strDate <= 9) {
strDate = "0" + strDate;
}
var currentdate = year + "年" + month + "月" + strDate + "日";
$("#time").html(currentdate)
return currentdate;
}
3.四舍五入
function toDecimal(x) {
var f = parseFloat(x);
if (isNaN(f)) {
return;
}
f = Math.round(x*100)/100;
return f;
}
4.Js将数字转成中文大写数字
var digitUppercase = function(n) {
var fraction = ['角', '分'];
var digit = [
'零', '壹', '贰', '叁', '肆',
'伍', '陆', '柒', '捌', '玖'
];
var unit = [
['元', '万', '亿'],
['', '拾', '佰', '仟']
];
var head = n < 0 ? '欠' : '';
n = Math.abs(n);
var s = '';
for (var i = 0; i < fraction.length; i++) {
s += (digit[Math.floor(n * 10 * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, '');
}
s = s || '整';
n = Math.floor(n);
for (var i = 0; i < unit[0].length && n > 0; i++) {
var p = '';
for (var j = 0; j < unit[1].length && n > 0; j++) {
p = digit[n % 10] + unit[1][j] + p;
n = Math.floor(n / 10);
}
s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
}
return head + s.replace(/(零.)*零元/, '元')
.replace(/(零.)+/g, '零')
.replace(/^整$/, '零元整');
}
5.判断数据是否为空
function dataIsNotNull(data) {
if (data != null && typeof(data) != "undefined" && data != "" && data != "''" && data != '') {
return true;
}
else {
return false;
}
}
6.字符串日期比较
/* 比较俩个字符串时间A-B
* A>B return 1
* A new Date(time2.replace("-", "/").replace("-", "/")).getTime()) {
return 1;
}else if(new Date(time1.replace("-", "/").replace("-", "/")).getTime() < new Date(time2.replace("-", "/").replace("-", "/")).getTime()) {
return -1;
}else if(new Date(time1.replace("-", "/").replace("-", "/")).getTime() == new Date(time2.replace("-", "/").replace("-", "/")).getTime()) {
return 0;
}else {
return 2;
}
};
7.验证邮件
function verifyEmailAddress(strEmail){
var myReg = /^[_a-zA-Z0-9_-_._-]+@([_a-zA-Z0-9_-]+\.)+[a-zA-Z]{2,3}$/;
return myReg.test(strEmail);
}
8.判断是否为日期数据
function itIsDate(DateString , Dilimeter)
{
if (DateString==null) return false;
if (Dilimeter=='' || Dilimeter==null)
Dilimeter = '-';
var tempy='';
var tempm='';
var tempd='';
var tempArray;
if (DateString.length<8 && DateString.length>10)
return false;
tempArray = DateString.split(Dilimeter);
if (tempArray.length!=3)
return false;
if (tempArray[0].length==4)
{
tempy = tempArray[0];
tempd = tempArray[2];
}
else
{
tempy = tempArray[2];
tempd = tempArray[1];
}
tempm = tempArray[1];
var tDateString = tempy + '/'+tempm + '/'+tempd+' 8:0:0';//加八小时是因为我们处于东八区
var tempDate = new Date(tDateString);
if (isNaN(tempDate))
return false;
if (((tempDate.getUTCFullYear()).toString()==tempy) && (tempDate.getMonth()==parseInt(tempm)-1) && (tempDate.getDate()==parseInt(tempd)))
{
return true;
}
else
{
return false;
}
}
9.复选框的全选与取消
function CheckAll(form){
var length = form.itemId.length;
var tocheck = form.chkall.checked;
if (length)
for (var i=0; i
10.数字输入控制
function InputIntNumberCheck(){
//为支持IE 或 Netscape
var theEvent=window.event || arguments.callee.caller.arguments[0];
var elm ;
var ver = navigator.appVersion;
if (ver.indexOf("MSIE") != -1){ // IE
if ( !((theEvent.keyCode >=48)&&(theEvent.keyCode<=57))){
theEvent.keyCode=0;
}
}else{ // Netscape
if ( !((theEvent.which >=48)&&(theEvent.which<=57))){
theEvent.stopPropagation();
theEvent.preventDefault();
}
}
//
}
11.设置以及获取cookie
function setCookie(name, value, Hours) {
var d = new Date();
var offset = 8;
var utc = d.getTime() + (d.getTimezoneOffset() * 60000);
var nd = utc + (3600000 * offset);
var exp = new Date(nd);
exp.setTime(exp.getTime() + Hours * 60 * 60 * 1000);
document.cookie = name + "=" + escape(value) + ";path=/;expires=" + exp.toGMTString() + ";domain=360doc.com;"
}
function getCookie(name) {
var arr = document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)"));
if (arr != null) return unescape(arr[2]);
return null
}
12.数据排序
function sort(arr, type = 1) {
return arr.sort((a, b) => {
switch (type) {
case 1:
return a - b;
case 2:
return b - a;
case 3:
return Math.random() - 0.5;
default:
return arr;
}
})
}
13.记忆函数(缓存函数运算结果)
function cached(fn) {
let cache = Object.create(null);
return function cachedFn(str) {
let hit = cache[str];
return hit || (cache[str] = fn(str))
}
}
14.获取浏览器信息
function getExplorerInfo() {
let t = navigator.userAgent.toLowerCase();
return 0 <= t.indexOf("msie") ? { //ie < 11
type: "IE",
version: Number(t.match(/msie ([\d]+)/)[1])
} : !!t.match(/trident\/.+?rv:(([\d.]+))/) ? { // ie 11
type: "IE",
version: 11
} : 0 <= t.indexOf("edge") ? {
type: "Edge",
version: Number(t.match(/edge\/([\d]+)/)[1])
} : 0 <= t.indexOf("firefox") ? {
type: "Firefox",
version: Number(t.match(/firefox\/([\d]+)/)[1])
} : 0 <= t.indexOf("chrome") ? {
type: "Chrome",
version: Number(t.match(/chrome\/([\d]+)/)[1])
} : 0 <= t.indexOf("opera") ? {
type: "Opera",
version: Number(t.match(/opera.([\d]+)/)[1])
} : 0 <= t.indexOf("Safari") ? {
type: "Safari",
version: Number(t.match(/version\/([\d]+)/)[1])
} : {
type: t,
version: -1
}
}
15.数组去重 返回一个新数组
function unique(arr){
if(!isArrayLink(arr)){ //不是类数组对象
return arr
}
let result = []
let objarr = []
let obj = Object.create(null)
arr.forEach(item => {
if(isStatic(item)){//是除了symbol外的原始数据
let key = item + '_' + getRawType(item);
if(!obj[key]){
obj[key] = true
result.push(item)
}
}else{//引用类型及symbol
if(!objarr.includes(item)){
objarr.push(item)
result.push(item)
}
}
})
return resulte
}
16.Base64数据导出文件 文件下载
function downloadFile(filename, data){
let DownloadLink = document.createElement('a');
if ( DownloadLink ){
document.body.appendChild(DownloadLink);
DownloadLink.style = 'display: none';
DownloadLink.download = filename;
DownloadLink.href = data;
if ( document.createEvent ){
let DownloadEvt = document.createEvent('MouseEvents');
DownloadEvt.initEvent('click', true, false);
DownloadLink.dispatchEvent(DownloadEvt);
}
else if ( document.createEventObject )
DownloadLink.fireEvent('onclick');
else if (typeof DownloadLink.onclick == 'function' )
DownloadLink.onclick();
document.body.removeChild(DownloadLink);
}
}
17.全屏
function toFullScreen(){
let elem = document.body;
elem.webkitRequestFullScreen
? elem.webkitRequestFullScreen()
: elem.mozRequestFullScreen
? elem.mozRequestFullScreen()
: elem.msRequestFullscreen
? elem.msRequestFullscreen()
: elem.requestFullScreen
? elem.requestFullScreen()
: alert("浏览器不支持全屏");
}
18.退出全屏
function toFullScreen(){
let elem = document.body;
elem.webkitRequestFullScreen
? elem.webkitRequestFullScreen()
: elem.mozRequestFullScreen
? elem.mozRequestFullScreen()
: elem.msRequestFullscreen
? elem.msRequestFullscreen()
: elem.requestFullScreen
? elem.requestFullScreen()
: alert("浏览器不支持全屏");
}
19.求出数组中最大非NaN值
function max(arr){
arr = arr.filter(item => !_isNaN(item))
return arr.length ? Math.max.apply(null, arr) : undefined
}
//max([1, 2, '11', null, 'fdf', []]) ==> 11
20.求出数组中最小非NaN值
function min(arr){
arr = arr.filter(item => !_isNaN(item))
return arr.length ? Math.min.apply(null, arr) : undefined
}
//min([1, 2, '11', null, 'fdf', []]) ==> 1
21.使用正则验证数字
function isNumber(val){
var regPos = /^\d+(\.\d+)?$/; //非负浮点数
var regNeg = /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/; //负浮点数
if(regPos.test(val) || regNeg.test(val)){
return true;
}else{
return false;
}
}
22.验证数组是否有重复元素
function hasRepeatValue(a) {
return /(\x0f[^\x0f]+)\x0f[\s\S]*\1/.test("\x0f" + a.join("\x0f\x0f") + "\x0f");
}
23.提取身份证中性别及出生日期信息
身份证号 倒数第二位是性别，奇数为男，偶数为女
function getIdcardData(){
var ido=document.getElementById('idCardNumberHandle');//身份证号input元素的ID
var bd=document.getElementById('birthdayHandle');
var sex=document.getElementById('sexHandle');
if(!/^\d{6}((?:19|20)((?:\d{2}(?:0[13578]|1[02])(?:0[1-9]|[12]\d|3[01]))|(?:\d{2}(?:0[13456789]|1[012])(?:0[1-9]|[12]\d|30))|(?:\d{2}02(?:0[1-9]|1\d|2[0-8]))|(?:(?:0[48]|[2468][048]|[13579][26])0229)))\d{2}(\d)[xX\d]$/.test(ido.value)){
alert('身份证号非法.');
return;
}
bd.value=(RegExp.$1).substr(0,4)+'-'+(RegExp.$1).substr(4,2)+'-'+(RegExp.$1).substr(6,2);//设置出生日期
ex.value=(parseInt(ido.value.charAt(ido.value.length-2))%2==0?'女':'男');//设置性别
}
24.在现有元素后插入一个新元素
function insertAfter(newElement,targetElement){
var parent = targetElement.parentNode;
if (parent.lastChild == targetElement) {
parent.appendChild(newElement);
} else {
parent.insertBefore(newElement,targetElement.nextSubling)
}
}
25.获取浏览器url中的参数值
var getURLParam = function(name) {
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)', "ig").exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null;
};
26.深度拷贝对象
function cloneObj(obj) {
var o = obj.constructor == Object ? new obj.constructor() : new obj.constructor(obj.valueOf());
for(var key in obj){
if(o[key] != obj[key] ){
if(typeof(obj[key]) == 'object' ){
o[key] = mods.cloneObj(obj[key]);
}else{
o[key] = obj[key];
}
}
}
return o;
}
27.生成随机数
function randombetween(min, max){
return min + (Math.random() * (max-min +1));
}
28.判断是手机还是pc端
function browserRedirect() {
var sUserAgent = navigator.userAgent.toLowerCase();
var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
var bIsMidp = sUserAgent.match(/midp/i) == "midp";
var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
var bIsAndroid = sUserAgent.match(/android/i) == "android";
var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM) {
//手机端
} else {
//pc端
$('*').css("width",'100%');
$('*').css("height",'100%');
}
}
browserRedirect(); //判断是手机端还是pc端
$(function(){
var h = window.screen.height;
var w = window.screen.width;
$('#myiframe').attr("width",w); //把宽属性追加进去
$('#myiframe').attr("height",h); //把高属性追加进去
})
29.根据出生日期计算年龄
//计算年龄
function getAge(strBirthday) {
var a = /^(\d{4})-(\d{2})-(\d{2})$/
if (a.test(strBirthday)) {
var birthYear = strBirthday.substring(0, 4);
var year = new Date();
var Nyear = year.getFullYear();
var Nage = Nyear - birthYear;
if (Nage <= 0) {
Nage = 1;
}
return Nage;//返回年龄
} else {
return "";
}
}
30.BMI计算
//BMI计算
function getBMI(w, h) {
h = h * 0.01;
var bmi = (w / (h * h)).toFixed(4);
return bmi;
}
31.体表面积计算
//体表面积计算
function getBodyArea(w, h) {
var bodyArea = (0.0061 * h + 0.0128 * w - 0.1529).toFixed(4);
return bodyArea;
}
32.根据身份证获取出生日期以及年龄
//根据身份证获取出生日期以及相应年龄是多少
$("#idNumber").on("blur", function () {
var num = Number($("#idNumber").val().split("").slice(6, 10).join(""))
var mon = $("#idNumber").val().substring(10, 12)
var da = $("#idNumber").val().substring(12, 14)
var birth = num + "/" + mon + "/" + da
var dt = new Date()
var year = dt.getFullYear()
$("#birthday").val(birth)
$("#age").text(year - num)
})
33.判断字符串是否是数字
function isNumber(val) {
var regPos = /^\d+(\.\d+)?$/;//非负浮点数
var regNeg = /^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$/;//负浮点数
if(regPos.test(val) || regNeg.test(val)) {
return true;
}else {
return false;
}
}
34.查询最近七天的日期(前七天 当前日期2021-10-13)
//返回最近七天的日期
function getday2() {
var days = [];
var date = new Date();
for(var i=0; i<=144;i+=24){ //144是前六天的小时数
var dateItem=new Date(date.getTime() - i * 60 * 60 * 1000); //使用当天时间戳减去以前的时间毫秒（小时*分*秒*毫秒）
var y = dateItem.getFullYear(); //获取年份
var m = dateItem.getMonth() + 1; //获取月份js月份从0开始，需要+1
var d= dateItem.getDate(); //获取日期
m = addDate0(m); //给为单数的月份补零
d = addDate0(d); //给为单数的日期补零
var valueItem= y + '-' + m + '-' + d; //组合
days.push(valueItem); //添加至数组
}
console.log('最近七天日期：',days);
return days;
}
//给日期加0
function addDate0(time) {
if (time.toString().length == 1) {
time = '0' + time.toString();
}
return time;
}
35.查询最近七天的日期(后七天 当前日期2021-10-13)
//返回最近七天的日期
function getday2() {
var days = [];
var date = new Date();
for(var i=0; i<=144;i+=24){ //144是前六天的小时数
var dateItem=new Date(date.getTime() + i * 60 * 60 * 1000); //使用当天时间戳减去以前的时间毫秒（小时*分*秒*毫秒）
var y = dateItem.getFullYear(); //获取年份
var m = dateItem.getMonth() + 1; //获取月份js月份从0开始，需要+1
var d= dateItem.getDate(); //获取日期
m = addDate0(m); //给为单数的月份补零
d = addDate0(d); //给为单数的日期补零
var valueItem= y + '-' + m + '-' + d; //组合
days.push(valueItem); //添加至数组
}
console.log('最近七天日期：',days);
return days;
}
//给日期加0
function addDate0(time) {
if (time.toString().length == 1) {
time = '0' + time.toString();
}
return time;
}
以上就是35个JS中实用工具函数的代码分享的详细内容，更多关于JS工具函数的资料请关注脚本之家其它相关文章！