es6 promise基本语法

promise基本语法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>promise基本语法</title>

</head>
<body>
<div id="ad">

</div>
<div></div>
<script>

    //实例化promise对象
    const p = new Promise((resolve, reject)=>{
        setTimeout(()=>{
            let data = '用户数据';
            //resolve(data);

            let err = '失败';
            reject(err);
        },1000);
    })

    p.then(
        value => {
            console.log(value);
        },
        reason => {
            console.log(reason);
        }
    )

</script>
</body>
</html>
posted @ 2021-06-21 12:00  胡勇健  阅读(50)  评论(0)    收藏  举报