e005-执行打印005

async function async1() {
  console.log('A')
  await async2()
  console.log('B')
}
async function async2() {
  console.log('C')
}
console.log('D')

setTimeout(function() {
  console.log('E')
})

async1()

new Promise(function(resolve) {
  console.log('F')
}).then(function() {
  console.log('G')
}).catch(() => {
    console.log('G2')
})

console.log('H')

答案

// 同步代码
D
A
C
F
H
//微任务执行
B
undefined
// 宏任务执行
E

async function async1() {
  console.log('A')
  await async2()
  console.log('B')
}
async function async2() {
  console.log('C')
}
console.log('D')

setTimeout(function() {
  console.log('E')
})

async1()

new Promise(function(resolve) {
  console.log('F')
  resolve(1)
}).then(function() {
  console.log('G')
}).catch(() => {
    console.log('G2')
})

console.log('H')

答案

// 同步代码
D
A
C
F
H
//微任务执行
B
G
undefined
// 宏任务执行
E

3

setTimeout(function () {
  console.log("1");
}, 0);
async function async1() {
  console.log("2");
  const data = await async2();
  console.log("3");
  return data;
}
async function async2() {
  return new Promise((resolve) => {
    console.log("4");
    resolve("async2的结果");
  }).then((data) => {
    console.log("5");
    return data;
  });
}
async1().then((data) => {
  console.log("6");
  console.log(data);
});
new Promise(function (resolve) {
  console.log("7");
  // resolve()
}).then(function () {
  console.log("8");
});

注意8那的 // resolve() 注掉了

输出

247536 async2 的结果 1

4.

setTimeout(function () {
  console.log("1");
}, 0);
async function async1() {
  console.log("2");
  const data = await async2();
  console.log("3");
  return data;
}
async function async2() {
  return new Promise((resolve) => {
    console.log("4");
    resolve("async2的结果");
  }).then((data) => {
    console.log("5");
    return data;
  });
}
async1().then((data) => {
  console.log("6");
  console.log(data);
});
new Promise(function (resolve) {
  console.log("7");
   resolve()
}).then(function () {
  console.log("8");
});

输出

2475836 async2 的结果 1