<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <script type="text/javascript">

        function testAlert(){
            alert("this is a test alert");
        }

        //testAlert();

        function testConfirm(){
            //var c = confirm("msg");
            //console.log(c);
            if(confirm("删除?")){
                alert("删除成功！")
            }
        }

        //testConfirm();

        function testPrompt(){
            //直接点击关闭或是取消    会返回null
            var username = prompt("用户名","zhangsan");
            console.log(username);
        }

        testPrompt();

    </script>
</head>
<body>

</body>
</html>