函数内部的异步函数

Question

var a=(function(){  setTimeOut(()=>'data',1000)   })()怎么样才能a() // 'data'var z=function(){  var promise=new  Promise(function(sus,err){setTimeout(()=>{    this.f='data'sus()  },1000)})return promise}var l=new z()l.then(function () {  console.log(this.f)})...自己弄出来了

Answer 1

题主你的setTimeout写错了...

var a=(function(){

  setTimeout(()=>console.log('data'),1000)

})()

Async/Await写法,算是函数内部的异步函数吧

function resolveAfter1Second(x) {

  return new Promise(resolve => {

    setTimeout(() => {

      resolve(x);

    }, 1000);

  });

}

async function dataShow(x) {

  const a = await resolveAfter1Second(x);

  return a;

}

dataShow("data").then(v => {

  console.log(v);

});