异步操作

时间 2021-01-14
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
        let promise=new Promise((resolve, reject)=>{
            //初始化promise状态
            setTimeout(()=>{
                resolve('厉害');
                //reject('抱歉');
                console.log('333')
            },2000);
            console.log('111')
        });
        console.log('222')
        promise
            .then((data)=>{//成功的回调
            console.log('成功了')
                },
                (error)=>{//失败的回调
                console.log('失败了')
                })
    </script>
</head>
<body>

</body>
</html>