2019-06-16 手写简易promise(blue老师)
2019-06-16 本文已影响0人
DreamNeverDie
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<script>
class Promise2{
constructor(cb){
this.end=false;
this.err=false;
this.result=null;
cb((...args)=>{
this.end=true;
this.err=false;
this.result=args;
if(this.succ){
this.succ(...args);
}
}, (...args)=>{
this.end=true;
this.err=true;
this.result=args;
if(this.faild){
this.faild(...args);
}
});
}
then(succ, faild){
this.succ=succ;
this.faild=faild;
if(this.end){
if(this.err){
faild(...this.result);
}else{
succ(...this.result);
}
}
}
}
</script>
</body>
</html>
