<html>
<head></head>
<body>
用户名：<input type="text" id="username" name="username" autofocus="autofocus"/><br/>
密码：<input type="text" id="password" name="password"/><br/>
<input type="submit" name="submitBtn" value="提交"/>
</body>
</html>
资料来源：https://blog.csdn.net/u010999809/article/details/75387718