qq_40492771的博客

//数组比较取不同 let c = a.concat(b).filter((cur, i, arr) => { return arr.indexOf(cur) === arr.lastIndexOf(cur); });

let oReq = new XMLHttpRequest(); oReq.open("GET", getUrl(requestUrlBase, `api/api?${stringify(queryParams)}`), true); oReq.responseType = "blob"; oReq.setRequestHeader("Content-Type", "application/octet-s...

window.speechSynthesis.speak(new window.SpeechSynthesisUtterance(‘你好，世界！’))

一var values = [1, 2, 3, 4, 5];values.sort(function(){ return Math.random() - 0.5;});console.log(values)二var res= [1, 2, 3, 4, 5];function shuffle(a) { for (let i = a.length; i; i--) { let j = Math.floor(Math.random() * i);

deviceList=[{name:‘1’,count:2},{name:‘2’,count:3},{name:‘3’,count:4},{name:‘4’,count:6},]let totalPrice = 0let sumdeviceList = deviceList.reduce((totalPrice, item) => totalPrice + item.count, 0)console.log(sumdeviceList )

//移入显示大图moveover = record => {var boximg = document.createElement(‘img’);boximg.style.width = ‘150px’;boximg.style.height = ‘150px’;boximg.style.position = ‘absolute’;boximg.style.left = ‘70px’;boximg.style.top = ‘-30px’;boximg.src = record.url;

ES7includes() 函数用来判断一个数组是否包含一个指定的值，如果包含则返回 true，否则返回falselet arr = ['react', 'angular', 'vue'] if (arr.includes('react')) { console.log('react存在')}在ES7中引入了指数运算符，具有与Math.pow(…)等效的计算结果。console.log(Math.pow(2, 10)) // 输出1024console.log(2**10) // 输出1

function sorBy(props){ return function(a,b) { return b[props] - a[props]; } } const data = [ {devTypeName: "a", count: 53}, {devTypeName: "b", count: 18}, {devTypeName: "c", count: 2}, {devTypeName: "d", count: 3}, {devTypeN.

(123).toLocaleString(‘zh-Hans-CN-u-nu-hanidec’)// “一二三”(123).toLocaleString(‘zh-Hans-CN’, { style: ‘percent’ })// “12,300%”(123).toLocaleString(‘zh-Hans-CN’, { style: ‘currency’, currency: ‘CNY’ }...

false Boolean(undefined) // false Boolean(null) // false Boolean(0) // false Boolean('') // false Boolean(NaN) // falsetrueBoolean(1) // trueBoolean('false') // trueBoolean([]) // trueBoole...

btoa()：任意值转为 Base64 编码atob()：Base64 编码转为原来的值var str = 'hello'btoa(str) //"aGVsbG8="atob('aGVsbG8=') //"hello"这两个方法不适合非ASCII码字符，会报错（比如中文）encodeURIComponent()decodeURIComponent(）encodeURIC...

提取信息中的网络链接:(h|H)(r|R)(e|E)(f|F) = (’|")?(\w|\|/|.)+(’|"| |>)?提取信息中的邮件地址:\w+([-+.]\w+)@\w+([-.]\w+).\w+([-.]\w+)提取信息中的图片链接:(s|S)(r|R)(c|C) = (’|")?(\w|\|/|.)+(’|"| |>)?提取信息中的IP地址:(\d+).(\d+).(...

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