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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div>
<button id="btn">click</button>
<img src="">
</div>
<!-- <script src="./手写一个event.js"></script> -->
<script src='./实现一个简单的promise.js'></script>
<script>
// const fn1 = () => {
// console.log('111')
// }
// const fn2 = () => {
// console.log('111')
// }
// document.getElementById('btn').addEventListener('click', () => {console.log(1)})
// document.getElementById('btn').addEventListener('click', () => {console.log(1)})
let pp = new Promise((res, rej) => {
setTimeout(() => {
res(22)
},1000)
})
// console.log(pp)
pp.then(res => {
console.log(res)
}, err => {console.log(err.message)})
const a = pp.then(res => {
return new Promise(resolve => {
setTimeout(() => {
resolve(res)
}, 1000)
})
}, err => console.log(err.message))
a.then(res => {
console.log(res)
})
console.log('end')
</script>
</body>
</html>