1、isStatic:检测数据是不是除了symbol外的原始数据
function isStatic(value) { return( typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || typeof value === 'undefined' || value === null ) }
2、isPrimitive:检测数据是不是原始数据
function isPrimitive(value) { return isStatic(value) || typeof value === 'symbol' }
3、isObject:判断数据是不是引用类型的数据 (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'); }
4、isObjectLike:检查 value 是否是 类对象。 如果一个值是类对象,那么它不应该是 null,而且 typeof 后的结果是 "object"
function isObjectLike(value) { return value != null && typeof value == 'object'; }
5、getRawType:获取数据类型,返回结果为 Number、String、Object、Array等
function getRawType(value) { return Object.prototype.toString.call(value).slice(8, -1) } //getoRawType([]) ==> Array
6、isPlainObject:判断数据是不是Object类型的数据
function isPlainObject(obj) { return Object.prototype.toString.call(obj) === '[object Object]' }
7、isArray:判断数据是不是数组类型的数据
function isArray(arr) { return Object.prototype.toString.call(arr) === '[object Array]' }
将isArray挂载到Array上
Array.isArray = Array.isArray || isArray;
8、isRegExp:判断数据是不是正则对象
function isRegExp(value) { return Object.prototype.toString.call(value) === '[object RegExp]' }
9、isDate:判断数据是不是时间对象
function isDate(value) { return Object.prototype.toString.call(value) === '[object Date]' }
10、isNative:判断 value 是不是浏览器内置函数
内置函数toString后的主体代码块为 [native code] ,而非内置函数则为相关代码,所以非内置函数可以进行拷贝(toString后掐头去尾再由Function转)
function isNative(value) { return typeof value === 'function' && /native code/.test(value.toString()) }
11、isFunction:检查 value 是不是函数
function isFunction(value) { return Object.prototype.toString.call(value) === '[object Function]' }
12、isLength:检查 value 是否为有效的类数组长度
function isLength(value) { return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= Number.MAX_SAFE_INTEGER; }
13、isArrayLike:检查 value 是否是类数组
如果一个值被认为是类数组,那么它不是一个函数,并且value.length是个整数,大于等于 0,小于或等于 Number.MAX_SAFE_INTEGER。这里字符串也将被当作类数组
function isArrayLike(value) { return value != null && isLength(value.length) && !isFunction(value); }
14、isEmpty:检查 value 是否为空
如果是null,直接返回true;如果是类数组,判断数据长度;如果是Object对象,判断是否具有属性;如果是其他数据,直接返回false(也可改为返回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 true; } return false; }
15、cached:记忆函数:缓存函数的运算结果
function cached(fn) { let cache = Object.create(null); return function cachedFn(str) { let hit = cache[str]; return hit || (cache[str] = fn(str)) } }
16、camelize:横线转驼峰命名
let camelizeRE = /-(\w)/g; function camelize(str) { return str.replace(camelizeRE, function(_, c) { return c "htmlcode">let hyphenateRE = /\B([A-Z])/g; function hyphenate(str){ return str.replace(hyphenateRE, '-$1').toLowerCase() } //abCd ==> ab-cd //使用记忆函数 let _hyphenate = cached(hyphenate);18、capitalize:字符串首位大写
function capitalize(str){ return str.charAt(0).toUpperCase() + str.slice(1) } // abc ==> Abc //使用记忆函数 let _capitalize = cached(capitalize)19、extend:将属性混合到目标对象中
function extend(to, _from) { for(let key in _from) { to[key] = _from[key]; } return to }20、Object.assign:对象属性复制,浅拷贝
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可以浅克隆一个对象:
let clone = Object.assign({}, target)简单的深克隆可以使用JSON.parse()和JSON.stringify(),这两个api是解析json数据的,所以只能解析除symbol外的原始类型及数组和对象
let clone = JSON.parse( JSON.stringify(target) )21、clone:克隆数据,可深度克隆
这里列出了原始类型,时间、正则、错误、数组、对象的克隆规则,其他的可自行补充
function clone(value, deep){ if(isPrimitive(value)){ return value } if (isArrayLike(value)) { //是类数组 value = Array.prototype.slice.call(value) return value.map(item => deep "htmlcode">//运行环境是浏览器 let inBrowser = typeof window !== 'undefined'; //运行环境是微信 let inWeex = typeof WXEnvironment !== 'undefined' && !!WXEnvironment.platform; let weexPlatform = inWeex && WXEnvironment.platform.toLowerCase(); //浏览器 UA 判断 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:获取浏览器信息
function getExplorerInfo() { let t = navigator.userAgent.toLowerCase(); return 0 <= t.indexOf("msie") "IE", version: Number(t.match(/msie ([\d]+)/)[1]) } : !!t.match(/trident\/.+"IE", version: 11 } : 0 <= t.indexOf("edge") "Edge", version: Number(t.match(/edge\/([\d]+)/)[1]) } : 0 <= t.indexOf("firefox") "Firefox", version: Number(t.match(/firefox\/([\d]+)/)[1]) } : 0 <= t.indexOf("chrome") "Chrome", version: Number(t.match(/chrome\/([\d]+)/)[1]) } : 0 <= t.indexOf("opera") "Opera", version: Number(t.match(/opera.([\d]+)/)[1]) } : 0 <= t.indexOf("Safari") "Safari", version: Number(t.match(/version\/([\d]+)/)[1]) } : { type: t, version: -1 } }24、isPCBroswer:检测是否为PC端浏览器模式
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:数组去重,返回一个新数组
function unique(arr){ if(!isArrayLink(arr)){ //不是类数组对象 return arr } let result = [] let objarr = [] let obj = Object.create(null) arr.forEach(item => { if(isStatic(item)){//是除了symbol外的原始数据 let key = item + '_' + getRawType(item); if(!obj[key]){ obj[key] = true result.push(item) } }else{//引用类型及symbol if(!objarr.includes(item)){ objarr.push(item) result.push(item) } } }) return resulte }26、Set简单实现
window.Set = window.Set || (function () { function Set(arr) { this.items = arr "htmlcode">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) ==> 12312312328、dateFormater:格式化时间
function dateFormater(formater, t){ let date = t "htmlcode">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 "htmlcode">function getPropByPath(obj, path, strict) { let tempObj = obj; path = path.replace(/\[(\w+)\]/g, '.$1'); //将[0]转化为.0 path = path.replace(/^\./, ''); //去除开头的. let keyArr = path.split('.'); //根据.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) {//开启严格模式,没找到对应key值,抛出错误 throw new Error('please transfer a valid prop path to form item!'); } break; } } return { o: tempObj, //原始数据 k: keyArr[i], //key值 v: tempObj "htmlcode">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; } // "1", b: "2", c: "3"}32、downloadFile:base64数据导出文件,文件下载
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 "浏览器不支持全屏"); }34、exitFullscreen:退出全屏
function exitFullscreen(){ let elem = parent.document; elem.webkitCancelFullScreen "切换失败,可尝试Esc退出"); }35、requestAnimationFrame:window动画
window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || window.oRequestAnimationFrame || function (callback) { //为了使setTimteout的尽可能的接近每秒60帧的效果 window.setTimeout(callback, 1000 / 60); }; window.cancelAnimationFrame = window.cancelAnimationFrame || Window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame || window.msCancelAnimationFrame || window.oCancelAnimationFrame || function (id) { //为了使setTimteout的尽可能的接近每秒60帧的效果 window.clearTimeout(id); }36、_isNaN:检查数据是否是非数字值
原生的isNaN会把参数转换成数字(valueof),而null、true、false以及长度小于等于1的数组(元素为非NaN数据)会被转换成数字,这不是我想要的。Symbol类型的数据不具有valueof接口,所以isNaN会抛出错误,这里放在后面,可避免错误
function _isNaN(v){ return !(typeof v === 'string' || typeof v === 'number') || isNaN(v) }37、max:求取数组中非NaN数据中的最大值
function max(arr){ arr = arr.filter(item => !_isNaN(item)) return arr.length "htmlcode">function min(arr){ arr = arr.filter(item => !_isNaN(item)) return arr.length "htmlcode">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) ==> -1.447432545236194540、Object.keys:返回一个由一个给定对象的自身可枚举属性组成的数组
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:返回一个给定对象自身的所有可枚举属性值的数组
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 值来填充 array,从start位置开始, 到end位置结束(但不包含end位置),返回原数组
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 "htmlcode">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 "htmlcode">Array.prototype.find = Array.prototype.find || function find(fn, ctx){ fn = fn.bind(ctx) let result; this.some((value, index, arr), thisValue) => { return fn(value, index, arr) "htmlcode">Array.prototype.findIndex = Array.prototype.findIndex || function findIndex(fn, ctx){ fn = fn.bind(ctx) let result; this.some((value, index, arr), thisValue) => { return fn(value, index, arr) "htmlcode">window.onload = function(){ setTimeout(function(){ let t = performance.timing console.log('DNS查询耗时 :' + (t.domainLookupEnd - t.domainLookupStart).toFixed(0)) console.log('TCP链接耗时 :' + (t.connectEnd - t.connectStart).toFixed(0)) console.log('request请求耗时 :' + (t.responseEnd - t.responseStart).toFixed(0)) console.log('解析dom树耗时 :' + (t.domComplete - t.domInteractive).toFixed(0)) console.log('白屏时间 :' + (t.responseStart - t.navigationStart).toFixed(0)) console.log('domready时间 :' + (t.domContentLoadedEventEnd - t.navigationStart).toFixed(0)) console.log('onload时间 :' + (t.loadEventEnd - t.navigationStart).toFixed(0)) if(t = performance.memory){ console.log('js内存使用占比 :' + (t.usedJSHeapSize / t.totalJSHeapSize * 100).toFixed(2) + '%') } }) }47、禁止某些键盘事件
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 + 点击a标签 ) || (event.returnValue = false) });48、禁止右键、选择、复制
['contextmenu', 'selectstart', 'copy'].forEach(function(ev){ document.addEventListener(ev, function(event){ return event.returnValue = false }) });github地址:https://github.com/hfhan/tools
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。
标签:JS,工具函数
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