"Some of the magical effect of JS"

1: async asynchronous callback (ES6)

async function test(){
       console.log("hello wolrd");
 }

 test().then(function(){
     console.log("回调测试")
 }); 

2: Sort sleeping

var numbers=[1,2,3,4,5,5,99,4,20,11,200];
numbers.forEach((num)=>{
    setTimeout(()=>{
        console.log(num)
    },num)
})

3: Fast de-emphasis   (ES6)

var arr = Array.from(new Set([1,2,3,4,4,3,5,6,7,8,8]));

 

The collection is constantly updated ........

 

Reproduced in: https: //www.cnblogs.com/Kummy/p/6782682.html