<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>用 async/await 来处理异步实例</title>
<style type="text/css">
</style>
</head>
<body>
<script type="text/javascript">
function doubleAfter2seconds(num) {
return new Promise((resolve, reject) => {
setTimeout(() => {
resolve(2 * num)
}, 2000);
} )
}
async function timeout() {
var result = await doubleAfter2seconds(30);
return result;
}
timeout().then(result => {
console.log(result);
})
console.log('虽然在后面，但是我先执行');
</script>
</body>
</html>
