ECMAScript6 学习笔记 一

let [a, b, c] = [1, 2, 3]let [foo, [[bar], baz]] = [1, [[2], 3]]let [ , , third] = ['one', 'two', 'three']let [head, ...tail] = [1, 2, 3, 4]// 默认值 匹配到undeined使用默认值let [foo = true] = []// 默认值可以用表达式function () {}let [x = f()] = [1]// 对象键值匹配let {foo, bar} = {foo: 1, bar: 2}let {foo: f, bar: b} = {foo: 1, bar: 2}//这里()是必须的，没有的话{}会被解析成代码块let foo({foo} = {foo: 1})

let x = 1let y = 2[x, y] = [y, x]

let jsonData = {  id: 42,  status: "OK",  data: [88,10]}let { id , status, data: number} = jsonDataconsole.log(id, status, number)//42, "OK", [88,10]

jQuery.ajax = function (url, {  async = true,  beforeSend = function () {},  cache = true,  complete = function () {},  crossDomain = false,  globa = true,  // ... more config}) {  // ... do something}

let map = new Map()map.set('first', 'hello')map.set('second', 'world')for (let [key, value] of map) {  console.log(key + " is " + value)}

'12'.padStart(10, 'YYYY-MM-DD') //'YYYY-MM-12''12'.padEnd(10,'YYYY-MM-DD') //'12YY-MM-DD'

let name = "Bob"let time = "today"`Hello ${name}, how are you ${time}?`// 执行模板let str = 'return ' + '`Hello ${name}!`'let func = new Function('name', str)func('Jack') //"Hello Jack!"let str = '(name) => `Hello ${name}!`'let func = eval.call(null,str);func('Jack') //"Hello Jack!"

let a = 5;let b = 10;tag`Hello ${ a + b } world ${a * b}`// 等同于tag(['Hello ', ' world', ''], 15, 50)