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平铺数组可以使用ES6的flat方法。但是在微信小程序里面并不支持ES6的flat方法，所以我写了下面这个递归函数let flat=function(arr,n=0){ return arr.reduce((a,b)=>{ if(Object.prototype.toString.call(b)==='[object Array]'&&n--){ ret...

class Circle { constructor() { this.shape = "circle" }}class Rectangle { constructor() { this.shape = "rectangle" }}class ShapeFactory { constructor() {} getShapeInstance(shapeType) { ...

class Circle{ constructor(){ this.shape="circle" }}class Rectangle{ constructor(){ this.shape="rectangle" }}class ShapeFactory{ constructor(){ } getShapeInstance(shapeType){ shapeTyp...

计算斐波那契数列第n项的值//方法一：递归var Fibonacci = function(n) { if(Number.isInteger(n) && n) { return n > 2 ? arguments.callee(n - 1) + arguments.callee(n - 2) : 1 }}console.log(Fibonacci(3), ...

const apiHttp = 'https://pdm.chiefchain.cn/'const header = { cookie: 'JSESSIONID=' + wx.getStorageSync('JSESSIONID'), 'content-type': 'application/x-www-form-urlencoded'}function request(url,...

let pipe = function(value) { let funStack = [] return new Proxy({}, { get: function(target, fnName,receive) { if(fnName === 'do') { return funStack.reduce((val, fn) => fn(val), value) ...

var arr=[1,2,3,null,NaN,undefined,Infinity,'']var brr=[0,1,2,3,4,null,NaN,undefined,Infinity,'']if(!Array.prototype.subsetTo){ Array.prototype.subsetTo=function(arr){ return this.every(v=>arr...

数组去重在ES6可以通过Set数据结构来实现let arr=[null,null,undefined,undefined,NaN,NaN,Infinity,Infinity,'',''，,1,'1']console.log([...new Set(arr)])//[null, undefined, NaN, Infinity, ""，1,'1']使用filter方法：let ar...

一：判断数组：console.log(Array.isArray([]))//trueconsole.log([] instanceof Array)//trueconsole.log(Object.prototype.toString.call([])==='[object Array]')//true二：判断函数let fn=()=>{}console.log(fn...

HTMLElement.prototype.toggle = function (...args) { let generator = function* (...args) { let i = 0; do { yield args[i++ % args.length] } while (true) }; ...