我怎么能同步叫诺

Question

同步调用Async函数

//return Boolean value
function SyncValue(){ 
var promise = new Promise((resolve, reject) => {
    if(/* asynchronous code execution is successful */) {
     return true;
    } else {
     return false;
    }
    return promise.then(returnValue =>{ return returnValue});
});

通话功能

if(SyncValue()){
   //here do the logic 
}

如何锁定函数调用以从“ syncValue”函数中检索值

Answer 1

您可以在IIFE中使用async/await语法，在其中等待异步调用解析然后使用该值。

function asyncCall() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve(5)
    }, 2000)
  });
}

(async function() {
  const result = await asyncCall();
  if (result) console.log(result)
})()