js 常用函数

解决0.1+0.2不等于0.3的小数累加精度问题

//
  formatFloat(num1, num2) {
    let baseNum, baseNum1, baseNum2;
    try {
      baseNum1 = num1.toString().split(".")[1].length;
    } catch (e) {
      baseNum1 = 0;
    }
    try {
      baseNum2 = num2.toString().split(".")[1].length;
    } catch (e) {
      baseNum2 = 0;
    }
    baseNum = Math.pow(10, Math.max(baseNum1, baseNum2));
    return (num1 * baseNum + num2 * baseNum) / baseNum;
  };

获取URL参数

     function getQuery (pa) {
        var url = window.location.href.replace(/#+.*$/, ''),
            params = url.substring(url.indexOf("?") + 1, url.length).split("&"),
            param = {};
        for (var i = 0; i < params.length; i++) {
            var pos = params[i].indexOf('='),//查找name=value
                key = params[i].substring(0, pos),
                val = params[i].substring(pos + 1);//提取value
            param[key] = val;
        }
        return (typeof(param[pa]) == "undefined") ? "" : param[pa];
    }

雪花

axios

 axios.post(this.apiUrl + 'Ccbshop/is_identical', params, {
          //  对 data 进行任意转换处理
          transformRequest: [function (data) {
            let ret = '';
            for (let it in data) {
              ret += encodeURIComponent(it) + '=' + encodeURIComponent(data[
                it]) + '&'
            }
            return ret
            // return this.$qs.stringify(data);
          }],
          headers: {
            "Content-Type": 'application/x-www-form-urlencoded;charset=UTF-8',
            "token": localStorage.getItem('token'),
            "os": '7',
            "version":'ccby1.0'
          }
        }).then(function (response) {
          let rs = response.data;
          if(rs.code == 100){
            mui.toast(rs.msg);
            return
          }
          
        }).catch(function(err){

        })
        

根据滚动位置 设置顶部进度条

(function(){
var contentH = document.getElementById('content').offsetHeight;
var clientH = document.documentElement.clientHeight
	window.onscroll = function(){
 		var scrollTop=document.documentElement&&document.documentElement.scrollTop;
let w = (scrollTop + clientH)/contentH

			document.getElementById('progress').style.width = w*100 +'%';

    }
})()

加解密 存储

import CryptoJS from 'crypto-js'
/* -----------------------------加密解密------------------------------------ Start */
const ivs = 'pH!@#_7'
const keys = 'Ph201903'
// AES加密
export function encryptAES (data) { // 加密
  var key = CryptoJS.enc.Utf8.parse(keys)
  var iv = CryptoJS.enc.Utf8.parse(ivs)
  var encrypted = CryptoJS.AES.encrypt(data, key,
    {
      iv: iv,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7
    })
  return encrypted.toString()
}
// AES解密
export function decryptAES (data) { // 解密
  var key = CryptoJS.enc.Utf8.parse(keys)
  var iv = CryptoJS.enc.Utf8.parse(ivs)
  var decrypted = CryptoJS.AES.decrypt(data, key,
    {
      iv: iv,
      mode: CryptoJS.mode.CBC,
      padding: CryptoJS.pad.Pkcs7
    })
  return decrypted.toString(CryptoJS.enc.Utf8)
}
/* -----------------------------加密解密------------------------------------ End */

/* -----------------------------localStorage------------------------------------ Start */
export function setLocalStorage (key, content) {
  if (!key) return
  if (typeof content !== 'string') {
    content = JSON.stringify(content)
  }
  window.localStorage.setItem(key, encryptAES(content))
}

export function getLocalStorage (key, f) {
  if (!key) return
  let content = window.localStorage.getItem(key)
  if (!content) return
  if (f) {
    return JSON.parse(decryptAES(content))
  }
  return decryptAES(content)
}

export function removeLocalStorage (key) {
  if (!key) return
  window.localStorage.removeItem(key)
}
/* -----------------------------localStorage------------------------------------ End */

时间格式转化

# moment 插件 支持多语言

/*
  DESC：对Date的扩展，将 Date 转化为指定格式的String。
      月(M)、日(d)、小时(h)、分(m)、秒(s)、季度(q) 可以用 1-2 个占位符，
      年(y)可以用 1-4 个占位符，毫秒(S)只能用 1 个占位符(是 1-3 位的数字) 例子：
      (new Date()).Format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423
      (new Date()).Format("yyyy-M-d h:m:s.S")      ==> 2006-7-2 8:9:4.18
*/
window.Date.prototype.Format = function (fmt) {
  var o = {
    'M+': this.getMonth() + 1,
    'd+': this.getDate(),
    'h+': this.getHours(),
    'm+': this.getMinutes(),
    's+': this.getSeconds(),
    'q+': Math.floor((this.getMonth() + 3) / 3),
    'S': this.getMilliseconds()
  }
  if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length))
  for (var k in o) {
    if (new RegExp('(' + k + ')').test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (('00' + o[k]).substr(('' + o[k]).length)))
    }
  }
  return fmt
}

Tips:

if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + ‘’).substr(4 - RegExp.$1.length))

正则表达式中

1. y+的意思是：匹配1个到多个y
2. (y+)的意思是：y+匹配到的内容可能通过分组来取到
3. RegExp.$1就是取到的y+匹配到的内容(‘yyyy’)
4. this.getFullYear() + ‘’ 转化为字符串