There are ways to aaa asynchronous return results ret=1
The function aaa () {
SetTimeout ()=& gt; {
Let ret=1
}, 2000)
}

I want to use the method of BBB synchronous returns the result of the aaa encapsulates the
Let ret=BBB ()

I've tried async await the results returned by the promise, yield returns undefined
Under which a great god can help

CodePudding user response:

 
The function aaa () {
The return of new Promise ((reslove, reject)=& gt; {
SetTimeout ()=& gt; {
Reslove (1) 
}, 2000) 
}). Then (res=& gt; {
Return res 
}) 
} 

Let a=await aaa () 

CodePudding user response:

 
The function aaa (res) {
SetTimeout ()=& gt; {
Let ret=1; 
Res (ret); 
}, 2000) 
} 

The function BBB () {
The return of new Promise (reslove=& gt; Aaa (reslove)) 
} 

! Async function () {
Var result=await BBB (); 
console.log(result); 
} ();