js常用工具函数

js常用工具函数

• （多为项目中需要，然后收集出来的，有一些根据自己项目需求做了修改，非全部原创，只为学习与记录）

// 数值千分化例如1000000转化为1,000,000,其中对小数做了处理，对含小数的多位数值友好。
  function toThousands(num) {
    var num = (num || 0).toString(), result = '';
    let num1 = ""
    let num2 = ""
    if(num.indexOf(".") >= 0) {
      num1 = num.split(".")[0]
      num2 = num.split(".")[1]
      
    } else {
      num1 = num
      num2 = "" 
    }
    while (num1.length > 3) {
        result = ',' + num1.slice(-3) + result;
        num1 = num1.slice(0, num1.length - 3);
    }
    if (num1 && num2) { result = num1 + result + "." + num2; }
    else {result = num1 + result}
    return result;
  }
  // 复制新对象
  function extendCopy(p)  {　
    var c = {};　　
    for (var i in p) {　　　　
        c[i] = p[i];　　
    }　　
    return c;
  }

  const compare = property => {
    return function (a, b) {
      if(a[property] > 0){
        return a[property]
      }else {
        return b[property]
      }
    }
  }
  // 处理域名
  function geturl (){
    var origin = location.origin;
    var url = 'https://sit.tohours.com/businessplanner/';
    if(origin.indexOf('p.tohours.com') >= 0 || origin.indexOf('svn.tohours.com') >= 0 || origin.indexOf('sit.tohours.com') >= 0 || origin.indexOf('127.0.0.1:8020') >= 0){
        url = 'https://sit.tohours.com/businessplanner/';
    }else {
        url = origin + '/businessplanner/';
    }
    return url;
  }
  // 时间格式化函数2
  function parseTime(time, cFormat) {
    if (arguments.length === 0) {
        return null
    }
    const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
    let date
    if (typeof time === 'object') {
        date = time
    } else {
        if ((typeof time === 'string') && (/^[0-9]+$/.test(time))) {
            time = parseInt(time)
        }
        if ((typeof time === 'number') && (time.toString().length === 10)) {
            time = time * 1000
        }
        date = new Date(time)
    }
    const formatObj = {
        y: date.getFullYear(),
        m: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        i: date.getMinutes(),
        s: date.getSeconds(),
        a: date.getDay()
    }
    const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { 
        return ['日', '一', '二', '三', '四', '五', '六'][value ] 
    }
    if (result.length > 0 && value < 10) {
        value = '0' + value
    }
    return value || 0
    })
    return time_str
}
  //时间格式化
  const formatTime = date => {
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()
  
    return [year, month, day].map(formatNumber).join('-') 
    + ' ' + [hour, minute, second].map(formatNumber).join(':')
  }
  
  const formatNumber = n => {
    n = n.toString()
    return n[1] ? n : '0' + n
  }
  // 判断是否为number
  const isNumber = obj => {
    return !Number.isNaN(parseFloat(obj)) && Number.isFinite(Number(obj))
  }
  // 保留两位小数（只有一位小数时不补0）
  const getTwoPlaceNum = a => {
    return Math.round(a * 100) / 100
  } 
  // 保留两位小数（只有一位小数时补0）
  const getTwoPlaceNum2 = a => {
    var aNew;
    var re = /([0-9]+.[0-9]{2})[0-9]*/;
    aNew = a.replace(re,"$1");
    return aNew
  }
  
  export {
    toThousands,
    extendCopy,
    compare,
    formatTime,
    parseTime,
    isNumber,
    geturl,
    getTwoPlaceNum
  }