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          JavaScript中的50+個實(shí)用工具函數(shù)(總結(jié))

          JavaScript可以做很多出色的事情,本篇文章給大家整理50+個實(shí)用工具函數(shù),可以幫助你提高工作效率并可以幫助調(diào)試代碼!!

          JavaScript中的50+個實(shí)用工具函數(shù)(總結(jié))

          1、isStatic: 檢測數(shù)據(jù)是不是除了symbol外的原始數(shù)據(jù)。

          function isStatic(value) {     return (         typeof value === 'string' ||         typeof value === 'number' ||         typeof value === 'boolean' ||         typeof value === 'undefined' ||         value === null     ) }

          2、isPrimitive:檢測數(shù)據(jù)是不是原始數(shù)據(jù)

          function isPrimitive(value) {     return isStatic(value) || typeof value === 'symbol' }

          3、isObject:判斷數(shù)據(jù)是不是引用類型的數(shù)據(jù)(例如:array,function,object,regexe,new Number(),new String())

          function isObject(value) {     let type = typeof value;     return value != null && (type == 'object' || type == 'function'); }

          4、isObjectLike:檢查value是否是類對象。如果一個值是類對象,那么它不應(yīng)該是null,而且typeof后的結(jié)果是“object”。

          function isObjectLike(value) {     return value != null && typeof value == 'object'; }

          5、getRawType:獲取數(shù)據(jù)類型,返回結(jié)果為Number、String、Object、Array等

          function getRawType(value) {     return Object.prototype.toString.call(value).slice(8, -1) } // getoRawType([]) ? Array

          6、isPlainObject:判斷數(shù)據(jù)是不是Object類型的數(shù)據(jù)

          function isPlainObject(obj) {     return Object.prototype.toString.call(obj) === '[object Object]' }

          7、isArray:判斷數(shù)據(jù)是不是數(shù)組類型的數(shù)據(jù)(Array.isArray的兼容寫法)

          function isArray(arr) {     return Object.prototype.toString.call(arr) === '[object Array]' }  // 將isArray掛載到Array上 Array.isArray = Array.isArray || isArray;

          8、isRegExp:判斷數(shù)據(jù)是不是正則對象

          function isRegExp(value) {     return Object.prototype.toString.call(value) === '[object RegExp]' }

          9、isDate:判斷數(shù)據(jù)是不是時間對象

          function isDate(value) {     return Object.prototype.toString.call(value) === '[object Date]' }

          10、isNative:判斷value是不是瀏覽器內(nèi)置函數(shù)

          內(nèi)置函數(shù)toString后的主體代碼塊為[native code] ,而非內(nèi)置函數(shù)則為相關(guān)代碼,所以非內(nèi)置函數(shù)可以進(jìn)行拷貝(toString后掐頭去尾再由Function轉(zhuǎn))

          function isNative(value) {     return typeof value === 'function' && /native code/.test(value.toString()) }

          11、isFunction:檢查value是不是函數(shù)

          function isFunction(value) {     return Object.prototype.toString.call(value) === '[object Function]' }

          12、isLength:檢查value是否為有效的類數(shù)組長度

          function isLength(value) {     return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= Number.MAX_SAFE_INTEGER; }

          13、isArrayLike:檢查value是否是類數(shù)組

          如果一個值被認(rèn)為是類數(shù)組,那么它不是一個函數(shù),并且value.length是個整數(shù),大于等于0,小于或等于Number.MAX_SAFE_INTEGER。這里字符串也被當(dāng)作類數(shù)組。

          function isArrayLike(value) {     return value != null && isLength(value.length) && !isFunction(value); }

          14、isEmpty:檢查value是否為空

          如果是null,直接返回true;如果是類數(shù)組,判斷數(shù)據(jù)長度;如果是Object對象,判斷是否具有屬性;如果是其他數(shù)據(jù),直接返回false(也可以改為返回true)

          function isEmpty(value) {     if (value == null) {         return true;     }     if (isArrayLike(value)) {         return !value.length;     } else if (isPlainObject(value)) {         for (let key in value) {             if (hasOwnProperty.call(value, key)) {                 return false;             }         }     }     return false; }

          15、cached:記憶函數(shù):緩存函數(shù)的運(yùn)算結(jié)果

          function cached(fn) {     let cache = Object.create(null);     return function cachedFn(str) {         let hit = cache[str];         return hit || (cache[str] = fn(str))     } }

          16、camelize:橫線轉(zhuǎn)駝峰命名

          let camelizeRE = /-(w)/g; function camelize(str) {     return str.replace(camelizeRE, function(_, c) {         return c ? c.toUpperCase() : '';     }) } //ab-cd-ef ==> abCdEf //使用記憶函數(shù) let _camelize = cached(camelize)

          17、hyphenate:駝峰命名轉(zhuǎn)橫線命名:拆分字符串,使用-相連,并且轉(zhuǎn)換為小寫

          let hyphenateRE = /B([A-Z])/g; function hyphenate(str){     return str.replace(hyphenateRE, '-$1').toLowerCase() } //abCd ==> ab-cd //使用記憶函數(shù) let _hyphenate = cached(hyphenate);

          18、capitalize:字符串首位大寫

          function capitalize(str) {     return str.charAt(0).toUpperCase() + str.slice(1) } // abc ==> Abc //使用記憶函數(shù) let _capitalize = cached(capitalize)

          19、extend:將屬性混合到目標(biāo)對象中

          function extend(to, _form) {     for(let key in _form) {         to[key] = _form[key];     }     return to }

          20、Object.assign:對象屬性復(fù)制,淺拷貝

          Object.assign = Object.assign || function() {     if (arguments.length == 0) throw new TypeError('Cannot convert undefined or null to object');     let target = arguments[0],         args = Array.prototype.slice.call(arguments, 1),         key;     args.forEach(function(item) {         for (key in item) {             item.hasOwnProperty(key) && (target[key] = item[key])         }     })     return target }

          使用Object.assign可以錢克隆一個對象:

          let clone = Object.assign({}, target);

          簡單的深克隆可以使用JSON.parse()和JSON.stringify(),這兩個api是解析json數(shù)據(jù)的,所以只能解析除symbol外的原始類型及數(shù)組和對象。

          let clone = JSON.parse( JSON.stringify(target) )

          21、clone:克隆數(shù)據(jù),可深度克隆

          這里列出了原始類型,時間、正則、錯誤、數(shù)組、對象的克隆規(guī)則,其他的可自行補(bǔ)充

          function clone(value, deep) {     if (isPrimitive(value)) {         return value     }     if (isArrayLike(value)) {  //是類數(shù)組         value = Array.prototype.slice.call(vall)         return value.map(item => deep ? clone(item, deep) : item)     } else if (isPlainObject(value)) {  //是對象         let target = {}, key;         for (key in value) {             value.hasOwnProperty(key) && ( target[key] = deep ? clone(value[key], value[key] ))         }     }     let type = getRawType(value);     switch(type) {         case 'Date':         case 'RegExp':         case 'Error': value = new window[type](value); break;     }     return value }

          22、識別各種瀏覽器及平臺

          //運(yùn)行環(huán)境是瀏覽器 let inBrowser = typeof window !== 'undefined'; //運(yùn)行環(huán)境是微信 let inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform; let weexPlatform = inWeex && WXEnvironment.platform.toLowerCase(); //瀏覽器 UA 判斷 let UA = inBrowser && window.navigator.userAgent.toLowerCase(); let isIE = UA && /msie|trident/.test(UA); let isIE9 = UA && UA.indexOf('msie 9.0') > 0; let isEdge = UA && UA.indexOf('edge/') > 0; let isAndroid = (UA && UA.indexOf('android') > 0) || (weexPlatform === 'android'); let isIOS = (UA && /iphone|ipad|ipod|ios/.test(UA)) || (weexPlatform === 'ios'); let isChrome = UA && /chrome/d+/.test(UA) && !isEdge;

          23、getExplorerInfo:獲取瀏覽器信息

          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     } }

          24、isPCBroswer:檢測是否為PC端瀏覽器模式

          function isPCBroswer() {     let e = navigator.userAgent.toLowerCase()         , t = "ipad" == e.match(/ipad/i)         , i = "iphone" == e.match(/iphone/i)         , r = "midp" == e.match(/midp/i)         , n = "rv:1.2.3.4" == e.match(/rv:1.2.3.4/i)         , a = "ucweb" == e.match(/ucweb/i)         , o = "android" == e.match(/android/i)         , s = "windows ce" == e.match(/windows ce/i)         , l = "windows mobile" == e.match(/windows mobile/i);     return !(t || i || r || n || a || o || s || l) }

          25、unique: 數(shù)組去重,返回一個新數(shù)組

          function unique(arr){     if(!isArrayLink(arr)){ //不是類數(shù)組對象         return arr     }     let result = []     let objarr = []     let obj = Object.create(null)          arr.forEach(item => {         if(isStatic(item)){//是除了symbol外的原始數(shù)據(jù)             let key = item + '_' + getRawType(item);             if(!obj[key]){                 obj[key] = true                 result.push(item)             }         }else{//引用類型及symbol             if(!objarr.includes(item)){                 objarr.push(item)                 result.push(item)             }         }     })          return resulte }

          26、Set簡單實(shí)現(xiàn)

          window.Set = window.Set || (function () {     function Set(arr) {         this.items = arr ? unique(arr) : [];         this.size = this.items.length; // Array的大小     }     Set.prototype = {         add: function (value) {             // 添加元素,若元素已存在,則跳過,返回 Set 結(jié)構(gòu)本身。             if (!this.has(value)) {                 this.items.push(value);                 this.size++;             }             return this;         },         clear: function () {             //清除所有成員,沒有返回值。             this.items = []             this.size = 0         },         delete: function (value) {             //刪除某個值,返回一個布爾值,表示刪除是否成功。             return this.items.some((v, i) => {                 if(v === value){                     this.items.splice(i,1)                     return true                 }                 return false             })         },         has: function (value) {             //返回一個布爾值,表示該值是否為Set的成員。             return this.items.some(v => v === value)         },         values: function () {             return this.items         },     }      return Set; }());

          27、repeat:生成一個重復(fù)的字符串,有n個str組成,可修改為填充為數(shù)組等

          function repeat(str, n) {     let res = '';     while(n) {         if(n % 2 === 1) {             res += str;         }         if(n > 1) {             str += str;         }         n >>= 1;     }     return res }; //repeat('123',3) ==> 123123123

          28、dateFormater:格式化時間

          function dateFormater(formater, t){     let date = t ? new Date(t) : new Date(),         Y = date.getFullYear() + '',         M = date.getMonth() + 1,         D = date.getDate(),         H = date.getHours(),         m = date.getMinutes(),         s = date.getSeconds();     return formater.replace(/YYYY|yyyy/g,Y)         .replace(/YY|yy/g,Y.substr(2,2))         .replace(/MM/g,(M<10?'0':'') + M)         .replace(/DD/g,(D<10?'0':'') + D)         .replace(/HH|hh/g,(H<10?'0':'') + H)         .replace(/mm/g,(m<10?'0':'') + m)         .replace(/ss/g,(s<10?'0':'') + s) } // dateFormater('YYYY-MM-DD HH:mm', t) ==> 2019-06-26 18:30 // dateFormater('YYYYMMDDHHmm', t) ==> 201906261830

          29、dateStrForma:將指定字符串由一種時間格式轉(zhuǎn)化為另一種。From的格式應(yīng)對應(yīng)str的位置

          function dateStrForma(str, from, to){     //'20190626' 'YYYYMMDD' 'YYYY年MM月DD日'     str += ''     let Y = ''     if(~(Y = from.indexOf('YYYY'))){         Y = str.substr(Y, 4)         to = to.replace(/YYYY|yyyy/g,Y)     }else if(~(Y = from.indexOf('YY'))){         Y = str.substr(Y, 2)         to = to.replace(/YY|yy/g,Y)     }      let k,i     ['M','D','H','h','m','s'].forEach(s =>{         i = from.indexOf(s+s)         k = ~i ? str.substr(i, 2) : ''         to = to.replace(s+s, k)     })     return to } // dateStrForma('20190626', 'YYYYMMDD', 'YYYY年MM月DD日') ==> 2019年06月26日 // dateStrForma('121220190626', '----YYYYMMDD', 'YYYY年MM月DD日') ==> 2019年06月26日 // dateStrForma('2019年06月26日', 'YYYY年MM月DD日', 'YYYYMMDD') ==> 20190626  // 一般的也可以使用正則來實(shí)現(xiàn) //'2019年06月26日'.replace(/(d{4})年(d{2})月(d{2})日/, '$1-$2-$3') ==> 2019-06-26

          30、getPropByPath:根據(jù)字符串路徑獲取對象屬性:‘obj[0].count’

          function getPropByPath(obj, path, strict) {       let tempObj = obj;       path = path.replace(/[(w+)]/g, '.$1'); //將[0]轉(zhuǎn)化為.0       path = path.replace(/^./, ''); //去除開頭的.        let keyArr = path.split('.'); //根據(jù).切割       let i = 0;       for (let len = keyArr.length; i < len - 1; ++i) {         if (!tempObj && !strict) break;         let key = keyArr[i];         if (key in tempObj) {             tempObj = tempObj[key];         } else {             if (strict) {//開啟嚴(yán)格模式,沒找到對應(yīng)key值,拋出錯誤                 throw new Error('please transfer a valid prop path to form item!');             }             break;         }       }       return {         o: tempObj, //原始數(shù)據(jù)         k: keyArr[i], //key值         v: tempObj ? tempObj[keyArr[i]] : null // key值對應(yīng)的值       }; };

          31、GetUrlParam:獲取Url參數(shù),返回一個對象

          function GetUrlParam(){     let url = document.location.toString();     let arrObj = url.split("?");     let params = Object.create(null)     if (arrObj.length > 1){         arrObj = arrObj[1].split("&");         arrObj.forEach(item=>{             item = item.split("=");             params[item[0]] = item[1]         })     }     return params; } // ?a=1&b=2&c=3 ==> {a: "1", b: "2", c: "3"}

          32、downloadFile:base64數(shù)據(jù)導(dǎo)出文件,文件下載

          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);     } }

          33、toFullScreen: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("瀏覽器不支持全屏"); }

          34、exitFullscreen:退出全屏

          function exitFullscreen() {     let elem = parent.document;     elem.webkitCancelFullScreen     ? elem.webkitCancelFullScreen()     : elem.mozCancelFullScreen     ? elem.mozCancelFullScreen()     : elem.cancelFullScreen     ? elem.cancelFullScreen()     : elem.msExitFullscreen     ? elem.msExitFullscreen()     : elem.exitFullscreen     ? elem.exitFullscreen()     : alert("切換失敗,可嘗試Esc退出"); }

          35、requestAnimationFrame:window動畫

          window.requestAnimationFrame = window.requestAnimationFrame ||     window.webkitRequestAnimationFrame ||     window.mozRequestAnimationFrame ||     window.msRequestAnimationFrame ||     window.oRequestAnimationFrame ||     function (callback) {         //為了使setTimteout的盡可能的接近每秒60幀的效果         window.setTimeout(callback, 1000 / 60);     } window.cancelAnimationFrame = window.cancelAnimationFrame ||     window.webkitCancelAnimationFrame ||     window.mozCancelAnimationFrame ||     window.msCancelAnimationFrame ||     window.oCancelAnimationFrame ||     function (id) {         //為了使setTimteout的盡可能的接近每秒60幀的效果         window.clearTimeout(id);     }

          36、_isNaN:檢查數(shù)據(jù)是否是非數(shù)字值

          function _isNaN(v){     return !(typeof v === 'string' || typeof v === 'number') || isNaN(v) }

          37、max:求取數(shù)組中非NaN數(shù)據(jù)中的最大值

          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

          38、min:求取數(shù)組中非NaN數(shù)據(jù)中的最小值

          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

          39、random:返回一個lower-upper直接的隨機(jī)數(shù)。(lower、upper無論正負(fù)與大小,但必須是非NaN的數(shù)據(jù))

          function random(lower, upper) {     lower = +lower || 0     upper = +upper || 0     return Math.random() * (upper - lower) + lower; } //random(0, 0.5) ==> 0.3567039135734613 //random(2, 1) ===> 1.6718418553475423 //random(-2, -1) ==> -1.4474325452361945

          40、Object.keys:返回一個由一個給定對象的自身可枚舉屬性組成的數(shù)組

          Object.keys = Object.keys || function keys(object) {     if (object === null || object === undefined) {         throw new TypeError('Cannot convert undefined or null to object');     }     let result = [];     if (isArrayLike(object) || isPlainObject(object)) {         for (let key in object) {             object.hasOwnProperty(key) && (result.push(key))         }     }     return result; }

          41、Object.values:返回一個給定對象自身的所有可枚舉屬性值的數(shù)組

          Object.values = Object.values || function values(object) {     if (object === null || object === undefined) {         throw new TypeError('Cannot convert undefined or null to object');     }     let result = [];     if (isArrayLike(object) || isPlainObject(object)) {         for (let key in object) {             object.hasOwnProperty(key) && (result.push(object[key]))         }     }     return result; }

          42、arr.fill:使用value值填充array,從start位置開始,到end位置結(jié)束(但不包含end位置),返回原數(shù)組

          Array.prototype.fill = Array.prototype.fill || function fill(value, start, end) {     let ctx = this     let length = ctx.length;          start = parseInt(start)     if(isNaN(start)){         start = 0     }else if (start < 0) {         start = -start > length ? 0 : (length + start);       }              end = parseInt(end)       if(isNaN(end) || end > length){           end = length       }else if (end < 0) {         end += length;     }          while (start < end) {         ctx[start++] = value;     }     return ctx; } //Array(3).fill(2) ===> [2, 2, 2]

          43、arr.includes:用來判斷一個數(shù)組是否包含一個指定的值,如果是返回true,否則返回false,可指定開始查詢的位置

          Array.prototype.includes = Array.prototype.includes || function includes(value, start) {     let ctx = this;     let length = ctx.length;     start = parseInt(start)     if(isNaN(start)) {         start = 0     } else if (start < 0) {         start = -start > length ? 0 : (length + start);     }     let index = ctx.indexOf(value);     return index >= start; }

          44、返回?cái)?shù)組中通過測試(函數(shù)fn內(nèi)判斷)的第一個元素的值

          Array.prototype.find = Array.prototype.find || function find(fn, ctx) {     ctx = ctx || this;     let result;     ctx.some((value, index, arr), thisValue) => {         return fn(value, index, arr) ? (result = value, true) : false     })     return result }

          45、arr.findIndex:返回?cái)?shù)組中通過測試(函數(shù)fn內(nèi)判斷)的第一個元素的下標(biāo)

          Array.prototype.findIndex = Array.prototype.findIndex || function findIndex(fn, ctx){     ctx = ctx || this          let result;     ctx.some((value, index, arr), thisValue) => {         return fn(value, index, arr) ? (result = index, true) : false     })          return result }

          46、performance.timing:利用performance.timing進(jìn)行性能分析

          window.onload = function() {     setTimeout(function() {         let t = performance.timing;         console.log('DNS查詢耗時 :' + (t.domainLookupEnd - t.domainLookupStart).toFixed(0))         console.log('TCP鏈接耗時 :' + (t.connectEnd - t.connectStart).toFixed(0))         console.log('request請求耗時 :' + (t.responseEnd - t.responseStart).toFixed(0))         console.log('解析dom樹耗時 :' + (t.domComplete - t.domInteractive).toFixed(0))         console.log('白屏?xí)r間 :' + (t.responseStart - t.navigationStart).toFixed(0))         console.log('domready時間 :' + (t.domContentLoadedEventEnd - t.navigationStart).toFixed(0))         console.log('onload時間 :' + (t.loadEventEnd - t.navigationStart).toFixed(0))         if (t = performance.memory) {             console.log('js內(nèi)存使用占比:' +  (t.usedJSHeapSize / t.totalJSHeapSize * 100).toFixed(2) + '%')         }     }) }

          47、禁止某些鍵盤事件

          document.addEventListener('keydown', function(event) {     return !(         112 == event.keyCode ||        //禁止F1         123 == event.keyCode ||        //禁止F12         event.ctrlKey && 82 == event.keyCode ||        //禁止ctrl+R         event.ctrlKey && 18 == event.keyCode ||        //禁止ctrl+N         event.shiftKey && 121 == event.keyCode ||          //禁止shift+F10         event.altKey && 115 == event.keyCode ||        //禁止alt+F4         "A" == event.srcElement.tagName && event.shiftKey        //禁止shift+點(diǎn)擊a標(biāo)簽     ) || (event.returnValue = false) });

          48、禁止右鍵、選擇、復(fù)制

          ['contextmenu', 'selectstart', 'copy'].forEach(function(ev) {     document.addEventListener(ev, function(event) {         return event.returnValue = false;     }) });

          49、numAdd – -計(jì)算數(shù)字相加

          function numAdd(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; };

          50、numSub – – 計(jì)算數(shù)字相減

          function numSub(num1, num2) {     let baseNum, baseNum1, baseNum2;     let precision;// 精度     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));     precision = (baseNum1 >= baseNum2) ? baseNum1 : baseNum2;     return ((num1 * baseNum - num2 * baseNum) / baseNum).toFixed(precision); };

          51、numMulti – – 計(jì)算數(shù)字相乘

          function numMulti(num1, num2) {     let baseNum = 0;     try {         baseNum += num1.toString().split(".")[1].length;     } catch (e) {     }     try {         baseNum += num2.toString().split(".")[1].length;     } catch (e) {     }     return Number(num1.toString().replace(".", "")) * Number(num2.toString().replace(".", "")) / Math.pow(10, baseNum); };

          52、numDiv – – 計(jì)算數(shù)字相除

          function numDiv(num1, num2) {     let baseNum1 = 0, baseNum2 = 0;     let baseNum3, baseNum4;     try {         baseNum1 = num1.toString().split(".")[1].length;     } catch (e) {         baseNum1 = 0;     }     try {         baseNum2 = num2.toString().split(".")[1].length;     } catch (e) {         baseNum2 = 0;     }     with (Math) {         baseNum3 = Number(num1.toString().replace(".", ""));         baseNum4 = Number(num2.toString().replace(".", ""));         return (baseNum3 / baseNum4) * pow(10, baseNum2 - baseNum1);     } };

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