SOURCE

console 命令行工具 X clear

                    
>
console
<!DOCYPE html>
<html>
    <head>
        <meta charset="utf-8"/>
        <title></title>
        <style type="text/css">

        </style>
        <script>
        </script>

    </head>
    <body>
        <button onclick="alertMes()">弹出信息</button>
        <br />
        <br />
        <button id="btn">弹出欢迎信息</button>

    </body>

</html>