weixin_44090040的博客

前言async用于申明function异步await用于等待一个异步方法执行完成一、async的用法async函数返回一个 Promise 对象//一个普通函数function getData(){ return "Hello World";}console.log(getData()) //Hello World//加上async后async function getData(){ return "Hello World";}console.log(get

一、 数组的解构赋值 let arr = [1, 2, 3]; let [a, b, c] = arr; console.log(a, b, c); //1,2,3 //模式匹配解构赋值 let [foo, [[bar], baz]] = [1, [[2], 3]]; console.log(foo, bar, baz); //1,2,3 //省略解构赋值 let [, , e, , f] = [1, 2, 3, 4, 5]; console.log(e, f); //3