等待后的 console.log 不打印其内容

Question

I read about async/await, but I've a question. I know that await only works with promises, but why in the code below, the last console doesn't print at all!

async function printMe() {
  console.log("First")
  await new Promise (resolve => {setTimeout(() => console.log("Async!!!"), 3000)})
  console.log("Last")
}

printMe()

Answer 1

When using Promise , you need to call the resolve method to fulfil the promise:

 async function printMe() { console.log("First") await new Promise (resolve => {setTimeout(() => { console.log("Async,.!") resolve() }, 3000)}) console.log("Last") } printMe()

NB: There is also a reject method available, you can find more about it by reading the related MDN page