Promise的API-构造函数-then-catch

 

 

 

 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise API</title>
</head>
<body>
    <script>
        //
        let p = new Promise((resolve, reject) => {
            // ** 同步调用
            // console.log(111);
            //修改 promise 对象的状态
            reject('error');
        });

        // console.log(222);

        //执行 catch 方法
        p.catch(reason => {
            console.log(reason);
        });
    </script>
</body>
</html>

 

posted @ 2021-06-19 23:00  juham  阅读(40)  评论(0)  编辑  收藏  举报