<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
const printSomething = arg => new Promise((resolve, reject) => {
setTimeout(() => {
console.log(‘printSomething: ‘, arg)
resolve(arg)
}, 1000)
})
function printOtherThing(arg) {
return new Promise((resolve, reject) => {
setTimeout(() => {
console.log(‘printOtherThing: ‘, arg)
resolve(arg)
}, 1000)
})
}
printSomething(‘Hello World‘).then(response => {
console.log(‘printSomething response: ‘, response)
})
printOtherThing(‘Hello Promise‘).then(response => {
console.log(‘printOtherThing response: ‘, response)
})
</script>
</body>
</html>
Promise封装一秒后打印Hello World