让你瞬间提高工作效率的常用js函数汇总(持续更新)

// 匹配邮箱

let reg = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$



// (新)匹配手机号

let reg = /^1[0-9]{10}$/;



// (旧)匹配手机号

let reg = /^1(3|4|5|7|8)[0-9]{9}$/;



// 匹配8-16位数字和字母密码的正则表达式

let reg = /^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{8,16}$/;



// 匹配国内电话号码 0510-4305211

let reg = /\d{3}-\d{8}|\d{4}-\d{7}/;



// 匹配身份证号码

let reg=/(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/;



// 匹配腾讯QQ号

let reg = /[1-9][0-9]{4,}/;



// 匹配ip地址

let reg = /\d+\.\d+\.\d+\.\d+/;



// 匹配中文

let reg = /^[\u4e00-\u9fa5]\*$/;

let isWechat = /micromessenger/i.test(navigator.userAgent),

    isWeibo = /weibo/i.test(navigator.userAgent),

    isQQ = /qq\//i.test(navigator.userAgent),

    isIOS = /(iphone|ipod|ipad|ios)/i.test(navigator.userAgent),

    isAndroid = /android/i.test(navigator.userAgent);

// 时间格式化

function format\_date(timeStamp) {

    let date = new Date(timeStamp);

    return date.getFullYear() + "年"

        + prefix\_zero(date.getMonth() + 1) + "月"

        + prefix\_zero(date.getDate()) + "日 "

        + prefix\_zero(date.getHours()) + ":"

        + prefix\_zero(date.getMinutes());

}



// 数字格式化

function prefix\_zero(num) {

    return num >= 10 ? num : "0" + num;

}



// 倒计时时间格式化

function format\_time(timeStamp) {

    let day = Math.floor(timeStamp / (24 \* 3600 \* 1000));

    let leave1 = timeStamp % (24 \* 3600 \* 1000);

    let hours = Math.floor(leave1 / (3600 \* 1000));

    let leave2 = leave1 % (3600 \* 1000);

    let minutes = Math.floor(leave2 / (60 \* 1000));

    let leave3 = leave2 % (60 \* 1000);

    let seconds = Math.floor(leave3 / 1000);

    if (day) return day + "天" + hours + "小时" + minutes + "分";

    if (hours) return hours + "小时" + minutes + "分" + seconds + "秒";

    if (minutes) return minutes + "分" + seconds + "秒";

    if (seconds) return seconds + "秒";

    return "时间到！";

}

// 是否支持触摸事件

let isSupportTouch = ("ontouchstart" in document.documentElement) ? true : false;



//禁用Enter键表单自动提交

document.onkeydown = function(event) {

    let target, code, tag;

    if (!event) {

        event = window.event; //针对ie浏览器

        target = event.srcElement;

        code = event.keyCode;

        if (code == 13) {

            tag = target.tagName;

            if (tag == "TEXTAREA") { return true; }

            else { return false; }

        }

    }

    else {

        target = event.target; //针对遵循w3c标准的浏览器，如Firefox

        code = event.keyCode;

        if (code == 13) {

            tag = target.tagName;

            if (tag == "INPUT") { return false; }

            else { return true; }

        }

    }

};

(function (doc, win) {

    var docEl = doc.documentElement,

        resizeEvt = 'orientationchange' in window ? 'orientationchange' : 'resize',

        recalc = function () {

            var clientWidth = docEl.clientWidth;

            var fontSize = 20;

            docEl.style.fontSize = fontSize + 'px';

            var docStyles = getComputedStyle(docEl);

            var realFontSize = parseFloat(docStyles.fontSize);

            var scale = realFontSize / fontSize;

            console.log("realFontSize: " + realFontSize + ", scale: " + scale);

            fontSize = clientWidth / 667 \* 20;

            if(isIphoneX()) fontSize = 19;

            fontSize = fontSize / scale;

            docEl.style.fontSize = fontSize + 'px';

        };

    // Abort if browser does not support addEventListene

    if (!doc.addEventListener) return;

    win.addEventListener(resizeEvt, recalc, false);

    doc.addEventListener('DOMContentLoaded', recalc, false);



    // iphoneX判断

    function isIphoneX(){

        return /iphone/gi.test(navigator.userAgent) && (screen.height == 812 && screen.width == 375)

    }



})(document, window);

// 敏感符号转义

function entities(s) {

    let e = {

        '"': '"',

        '&': '&',

        '<': '&lt;',

        '>': '&gt;'

    }

    return s.replace(/["<>&]/g, m => {

        return e[m]

    })

}

/\*\*

 \* 节流函数--规定在一个单位时间内，只能触发一次函数。如果这个单位时间内触发多次函数，只有一次生效。

 \*/

function throttle(fun, delay) {

    let last, deferTime

    return function (args) {

        let that = this

        let \_args = arguments

        let now = +new Date()

        if (last && now < last + delay) {

            clearTimeout(deferTimer)

            deferTimer = setTimeout(function () {

                last = now

                fun.apply(that, \_args)

            }, delay)

        }else {

            last = now

            fun.apply(that,\_args)

        }

    }

}



/\*\*

 \* 防抖函数--在事件被触发n秒后再执行回调，如果在这n秒内又被触发，则重新计时

 \*/

 function debounce(fun, delay) {

    return function (args) {

        let that = this

        clearTimeout(fun.id)

        fun.id = setTimeout(function () {

            fun.call(that, args)

        }, delay)

    }

}



// 观察者模式

let Observer = (function(){

  let t \_\_messages = {};

  return {

    regist: function(type, fn) {

      if(typeof \_\_messages[type] === 'undefined') {

        messages[type] = [fn];

      }else {

        \_\_messages[type].push(fn);

      }

    },

    fire: function(type, args) {

      if(!\_\_messages[type]){

        return

      }

      let events = {

        type: type,

        args: args || {}

      },

      i = 0,

      len = \_\_messages[type].length;

      for(;i<len;i++){

        \_\_messages[type][i].call(this, events);

      }

    },

    remove: function(type, fn) {

      if(\_\_messages[type] instanceof Array){

        let i = \_\_messages[type].length -1;

        for(;i>=0;i--){

          \_\_messages[type][i] === fn && \_\_messages[type].splice(i, 1)

        }

      }

    }

  }

})();



 // 模板渲染方法

 function formatString(str, data) {

   return str.replace(/\{\{(\w+)\}\}/g, function(match, key) {

     return typeof data[key] === undefined ? '' : data[key]

   })

 }

 

 // 冒泡排序

function bubbleSort(arr) {

    for (let i = arr.length - 1; i > 0; i--) {

      for (let j = 0; j < i; j++) {

        if (arr[j] > arr[j + 1]) {

          swap(arr, j, j + 1);

        }

      }

    }

    return arr;

}



// 置换函数

function swap(arr, indexA, indexB) {

    [arr[indexA], arr[indexB]] = [arr[indexB], arr[indexA]];

}



// 数组去重

function distinct(arr = testArr) {

    return arr.filter((v, i, array) => array.indexOf(v) === i)

}