实现 sleep 函数

[sihai00]

sleep函数

延时函数：等待一段时间，再继续进行

1. Promise
2. Generator
3. async
4. es5

Promise

//Promise
const sleep = time => {
  return new Promise(resolve => setTimeout(resolve,time))
}
sleep(1000).then(()=>{
  console.log(1)
})

Generator

//Generator
function* sleepGenerator(time) {
  yield new Promise(function(resolve,reject){
    setTimeout(resolve,time);
  })
}
sleepGenerator(1000).next().value.then(()=>{console.log(1)})

async

//async
function sleep(time) {
  return new Promise(resolve => setTimeout(resolve,time))
}
async function output() {
  let out = await sleep(1000);
  console.log(1);
  return out;
}
output();

es5

//ES5
function sleep(callback,time) {
  if(typeof callback === 'function')
    setTimeout(callback,time)
}

function output(){
  console.log(1);
}
sleep(output,1000);

参考

实现一个 sleep 函数