SOURCE

// function timeout(ms) {
//   return new Promise((resolve) => {
//     setTimeout(resolve, ms);
//   });
// }

// timeout 还是换一下写法
async function timeout(ms) {
  await new Promise((resolve) => {
    setTimeout(resolve, ms);
  });
}

// async表示函数里有异步操作，await表示紧跟在后面的表达式需要等待结果。
async function asyncPrint(value, ms) {
  console.log('start run');
  await timeout(ms);
  console.log(value, new Date());
  
  await timeout(ms);
  console.log(value, new Date());
  
  console.log("end");
}

asyncPrint('hello world', 2000);