经典面试题集1-求输出

1.宏任务和微任务

async  function  async1 ()  {
    console.log('async1 start');
    await  async2();
    console.log('async1 end')
}
async  function  async2 ()  {
    console.log('async2')
}
console.log('script start');
setTimeout(function ()  {
    console.log('setTimeout')
},  0);
async1();
new  Promise(function (resolve)  {
    console.log('promise1');
    resolve()
}).then(function ()  {
    console.log('promise2')
});
console.log('script end')

// script start
// async1 start
// async2
// promise1
// script end
// async1 end
// promise2
// setTimeout