Promise中有resolve和无resolve的代码执行顺序

请写出下面代码的输出顺序:

示例1:
console.log('script start')

new Promise(function(resolve) {
  console.log('promise')
  resolve()
  console.log('promise after resolve')
}).then(function() {
  console.log('promise then')
})

console.log('script end')
示例2:
console.log('script start')

await new Promise(function(resolve) {
  console.log('promise')
  resolve()
  console.log('promise after resolve')
}).then(function() {
  console.log('promise then')
})

console.log('script end')
示例3:
console.log('script start')

await new Promise(function(resolve) {
  console.log('promise')
  return resolve()
  console.log('promise after resolve')
}).then(function() {
  console.log('promise then')
})

console.log('script end')
示例4:
console.log('run begin')
run()
console.log('run end')

async function run() {
  console.log(0)
  for (let i = 1; i <= 5; i++) {
    await func1()
  }
}

async function func1() {
  console.log('func1 begin')
  await new Promise((resolve, reject) => {
    console.log('promise')
  })
  console.log('func1 end')
}
示例5:
console.log('run begin')
run()
console.log('run end')

async function run() {
  console.log(0)
  for (let i = 1; i <= 5; i++) {
    await func1()
  }
}

async function func1() {
  console.log('func1 begin')
  await new Promise((resolve, reject) => {
    console.log('promise')
    resolve()
  })
  console.log('func1 end')
}

延伸阅读:一道setTimeout async promise执行顺序的笔试题引发的思考

评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值