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Promise code example analysis in ES6

小云云Original: 2018-01-26 16:32:571275browse

This article mainly shares with you the analysis of Promise code examples in ES6. I hope you can better understand the usage of promise. Interested friends can refer to it. I hope it can help everyone.

Without further ado, I will post the code directly for you. The details are as follows:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
</head>
<body>
<script>
var a=0
var test=function(resolve, reject){
  setTimeout(function(){
    a=4;
    console.log(a)
    if(a<2){resolve(&#39;200 OK&#39;);}
    if(a>2){reject(&#39;400 died&#39;);}
  },3000)
}
var p1=new Promise(test);
p1.then(function(resolve){
  console.log(resolve)
},function(reject){
  console.log(reject);
})
</script>
</body>
</html>

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