js暂停执行的方法

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

// 使用
console.log('Start');
sleep(3000).then(() => {
  console.log('End');
});

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

// 使用
(async () => {
  console.log('Start');
  await sleep(3000);
  console.log('End');
})();