25js基础,三大基础弹框

<head>
    <meta charset="UTF-8">
    <title>4三大基础弹框</title>
</head>
<body>
        <script>
            //三大基础弹框
            //1:提示框（警告框），无返回值
            //alert("危险操作")

            //2:确认框，返回值true/fourse
            //var n1 = confirm("确定退出吗")
            //document.writeln(n1+"<br>");

            //3:输入框，返回值字符串/null

            var n2 = prompt("请输入","")
            document.writeln(n2+"<br>");
        </script>

</body>

posted on 2022-04-10 11:43 小小程序猿level1 阅读(40) 评论(0) 收藏举报