我的浏览器出不来，显示404，我哪里出错了？



```javascript
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
        <script type="text/javascript">
            var flag=window.confirm("确定要删除此条信息吗？");
            if(flag==true){
                alert("删除成功");
            }else{
                alert("你取消了删除");
            }
        </script>
</body>
</html>

404文件路径不对吧