Promise async await打印

async function displayNumbersSequentially() {
  console.log('Start');

  const valueFromPromise1 = await slowPromise(1000, 'Value from Promise 1');
  console.log(valueFromPromise1);

  const valueFromPromise2 = await slowPromise(500, 'Value from Promise 2');
  console.log(valueFromPromise2);

  console.log('End');
}

function slowPromise(delay, value) {
  return new Promise(resolve => setTimeout(() => resolve(value), delay));
}

console.log('Before calling async function');
displayNumbersSequentially();
console.log('After calling async function, but before it completes');

打印顺序

Before calling async function
Start
After calling async function, but before it completes
Value from Promise 1
Value from Promise 2
End

async function foo() {
  console.log(2);
  console.log(await Promise.resolve(8));
  console.log(9);
}

async function bar() {
  console.log(await 6);
  console.log(7);
}

console.log(1);
foo();
console.log(3);
bar();
console.log(5);

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