經常使用js開發工具彙總android
//0、獲取url指定參數 function getParams(name) { var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i'); var r = window.location.search.substr(1).match(reg); if (r != null) { return decodeURIComponent(r[2]); } return null; } //一、isStatic:檢測數據是否是除了symbol外的原始數據 function isStatic(value) { return ( typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || typeof value === 'undefined' || value === null ) } //二、isPrimitive:檢測數據是否是原始數據 function isPrimitive(value) { return isStatic(value) || typeof value === 'symbol' } //三、isObject:判斷數據是否是引用類型的數據 (例如: arrays, functions, objects, regexes, new Number(0),以及 new String('')) function isObject(value) { let type = typeof value; return value != null && (type == 'object' || type == 'function'); } //四、isObjectLike:檢查 value 是不是 類對象。 若是一個值是類對象,那麼它不該該是 null,並且 typeof 後的結果是 "object" function isObjectLike(value) { return value != null && typeof value == 'object'; } //五、getRawType:獲取數據類型,返回結果爲 Number、String、Object、Array等 function getRawType(value) { return Object.prototype.toString.call(value).slice(8, -1) } //getoRawType([]) ==> Array //六、isPlainObject:判斷數據是否是Object類型的數據 function isPlainObject(obj) { return Object.prototype.toString.call(obj) === '[object Object]' } //七、isArray:判斷數據是否是數組類型的數據 function isArray(arr) { return Object.prototype.toString.call(arr) === '[object Array]' } //將isArray掛載到Array上 Array.isArray = Array.isArray || isArray; //八、isRegExp:判斷數據是否是正則對象 function isRegExp(value) { return Object.prototype.toString.call(value) === '[object RegExp]' } //九、isDate:判斷數據是否是時間對象 function isDate(value) { return Object.prototype.toString.call(value) === '[object Date]' } //十、isNative:判斷 value 是否是瀏覽器內置函數 //內置函數toString後的主體代碼塊爲 [native code] ,而非內置函數則爲相關代碼,因此非內置函數能夠進行拷貝(toString後掐頭去尾再由Function轉) function isNative(value) { return typeof value === 'function' && /native code/.test(value.toString()) } //十一、isFunction:檢查 value 是否是函數 function isFunction(value) { return Object.prototype.toString.call(value) === '[object Function]' } //十二、isLength:檢查 value 是否爲有效的類數組長度 function isLength(value) { return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= Number.MAX_SAFE_INTEGER; } //1三、isArrayLike:檢查 value 是不是類數組 //若是一個值被認爲是類數組,那麼它不是一個函數,而且value.length是個整數,大於等於 0,小於或等於 Number.MAX_SAFE_INTEGER。這裏字符串也將被看成類數組。 function isArrayLike(value) { return value != null && isLength(value.length) && !isFunction(value); } //1四、isEmpty:檢查 value 是否爲空 //若是是null,直接返回true;若是是類數組,判斷數據長度;若是是Object對象,判斷是否具備屬性;若是是其餘數據,直接返回false(也可改成返回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; } //1五、cached:記憶函數:緩存函數的運算結果 function cached(fn) { let cache = Object.create(null); return function cachedFn(str) { let hit = cache[str]; return hit || (cache[str] = fn(str)) } } //1六、camelize:橫線轉駝峯命名 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 let _camelize = cached(camelize) //1七、hyphenate:駝峯命名轉橫線命名:拆分字符串,使用 - 相連,而且轉換爲小寫 let hyphenateRE = /\B([A-Z])/g; function hyphenate(str) { return str.replace(hyphenateRE, '-$1').toLowerCase() } //abCd ==> ab-cd //使用記憶函數 let _hyphenate = cached(hyphenate); //1八、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 let _capitalize = cached(capitalize) ///1九、extend:將屬性混合到目標對象中 function extend(to, _from) { for (let key in _from) { to[key] = _from[key]; } return to } //20、Object.assign:對象屬性複製,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能夠淺克隆一個對象: let clone = Object.assign({}, target) //簡單的深克隆可使用JSON.parse()和JSON.stringify(),這兩個api是解析json數據的,因此只能解析除symbol外的原始類型及數組和對象 let clone = JSON.parse(JSON.stringify(target)) //2一、clone:克隆數據,可深度克隆 //這裏列出了原始類型,時間、正則、錯誤、數組、對象的克隆規則,其餘的可自行補充 function clone(value, deep) { if (isPrimitive(value)) { return value } if (isArrayLike(value)) { //是類數組 value = Array.prototype.slice.call(value) 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], deep) : value[key]) } } let type = getRawType(value) switch (type) { case 'Date': case 'RegExp': case 'Error': value = new window[type](value); break; } return value } //2二、識別各類瀏覽器及平臺 //運行環境是瀏覽器 let inBrowser = typeof window !== 'undefined'; //運行環境是微信 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; //2三、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 } } //2四、isPCBroswer:檢測是否爲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) } //2五、unique:數組去重,返回一個新數組 function unique(arr) { if (!isArrayLink(arr)) { //不是類數組對象 return arr } let result = [] let objarr = [] let obj = Object.create(null) arr.forEach(item => { if (isStatic(item)) {//是除了symbol外的原始數據 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 } //2六、Set簡單實現 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 結構自己。 if (!this.has(value)) { this.items.push(value); this.size++; } return this; }, clear: function () { //清除全部成員,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,表示該值是否爲Set的成員。 return this.items.some(v => v === value) }, values: function () { return this.items }, } return Set; }()); //2七、repeat:生成一個重複的字符串,有n個str組成,可修改成填充爲數組等 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 //2八、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 //2九、dateStrForma:將指定字符串由一種時間格式轉化爲另外一種from的格式應對應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 // 通常的也可使用正則來實現 //'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]轉化爲.0 path = path.replace(/^\./, ''); //去除開頭的. let keyArr = path.split('.'); //根據.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) {//開啓嚴格模式,沒找到對應key值,拋出錯誤 throw new Error('please transfer a valid prop path to form item!'); } break; } } return { o: tempObj, //原始數據 k: keyArr[i], //key值 v: tempObj ? tempObj[keyArr[i]] : null // key值對應的值 }; }; //3一、GetUrlParam:獲取Url參數,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"} //3二、downloadFile:base64數據導出文件,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); } } //3三、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"); } //3四、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"); } //3五、requestAnimationFrame:window動畫 window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame || function (callback) { //爲了使setTimteout的儘量的接近每秒60幀的效果 window.setTimeout(callback, 1000 / 60); }; window.cancelAnimationFrame = window.cancelAnimationFrame || Window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame || window.msCancelAnimationFrame || window.oCancelAnimationFrame || function (id) { //爲了使setTimteout的儘量的接近每秒60幀的效果 window.clearTimeout(id); } //3六、_isNaN:檢查數據是不是非數字值 //原生的isNaN會把參數轉換成數字(valueof),而null、true、false以及長度小於等於1的數組(元素爲非NaN數據)會被轉換成數字,這不是我想要的。Symbol類型的數據不具備valueof接口,因此isNaN會拋出錯誤,這裏放在後面,可避免錯誤 function _isNaN(v) { return !(typeof v === 'string' || typeof v === 'number') || isNaN(v) } 3//七、max:求取數組中非NaN數據中的最大值 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 //3八、min:求取數組中非NaN數據中的最小值 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 //3九、random:返回一個lower - upper之間的隨機數lower、upper不管正負與大小,但必須是非NaN的數據 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 } //4一、Object.values:返回一個給定對象自身的全部可枚舉屬性值的數組 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 } //4二、arr.fill:使用 value 值來填充 array,從start位置開始, 到end位置結束(但不包含end位置),返回原數組 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] //4三、arr.includes:用來判斷一個數組是否包含一個指定的值,若是是返回 true,不然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; } //4四、arr.find:返回數組中經過測試(函數fn內判斷)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 } //4五、arr.findIndex :返回數組中經過測試(函數fn內判斷)的第一個元素的下標 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 } //4六、performance.timing:利用performance.timing進行性能分析 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連接耗時 :' + (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('白屏時間 :' + (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內存使用佔比 :' + (t.usedJSHeapSize / t.totalJSHeapSize * 100).toFixed(2) + '%') } }) } //4七、禁止某些鍵盤事件 document.addEventListener('keydown', function (event) { return !( 112 == event.keyCode || //F1 123 == event.keyCode || //F12 event.ctrlKey && 82 == event.keyCode || //ctrl + R event.ctrlKey && 78 == event.keyCode || //ctrl + N event.shiftKey && 121 == event.keyCode || //shift + F10 event.altKey && 115 == event.keyCode || //alt + F4 "A" == event.srcElement.tagName && event.shiftKey //shift + 點擊a標籤 ) || (event.returnValue = false) }); //4八、禁止右鍵、選擇、複製 ['contextmenu', 'selectstart', 'copy'].forEach(function (ev) { document.addEventListener(ev, function (event) { return event.returnValue = false }) }); //隨機獲取數組一個值 Array.prototype.random = function () { var idx = Math.floor((Math.random() * this.length)); var n = this.slice(idx, idx + 1)[0]; return n; } //數組進行隨機排序 Array.prototype.randomsort = function (a, b) { return Math.random() > .5 ? -1 : 1; //經過隨機產生0到1的數,而後判斷是否大於0.5從而影響排序,產生隨機性的效果。 } //查找數組指定索引 Array.prototype.indexOf = function (val) { for (var i = 0; i < this.length; i++) { if (this[i] == val) return i; } return -1; }; //添加數組刪除方法 Array.prototype.remove = function (val) { var index = this.indexOf(val); if (index > -1) { this.splice(index, 1); } };