04 es6 特性

let const

解构赋值

const data = {
  name: 'John',
  age: 30,
}
let { name, age } = data
// name = data.name
// age = data.age

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箭头函数

;() => {
  console.log('hello world')
}

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Promise

.then() return 返回的值会传给下一个 then 作为参数接收

.all([P1, P2 [,...]]) 全部成功 fulfilled 状态 才 then.race([P1, P2 [,...]]) “赛马模式”，只要有 Promise fulfilled(成功) 就 then

let p = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('resolve value')
  }, 2000)
})
p.then((res) => {
  console.log(res || 'hello world')
})

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Iterator(迭代器) 和 for...of

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生成器，generator

function* g1() {}