js 宏微任务执行顺序

一，直接打开地址查看

https://jakearchibald.com/2015/tasks-microtasks-queues-and-schedules/

console.log('script start'); 
setTimeout(function () {     
  console.log('setTimeout');
}, 0);

Promise.resolve()     
  .then(function () {
    console.log('promise1');
  })
  .then(function () {
    console.log('promise2');
  });

console.log('script end');

输出 script start 》script end》 promise1 》promise2》setTimeout