<!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>
<link rel="stylesheet" type="text/css" href="css/style.css">
</style>
</head>
<body>
<div class="box" id="box">
<h2>注册</h2>
<form action="" method="post">
<ul>
<li>
<label><span>*</span>用户名：</label>
<input type="text" name="username" placeholder="只能为英文字母、数字、下划线" id="username">
</li>
<li>
<label><span>*</span>电子邮箱：</label>
<input type="text" name="email" placeholder="输入正确的电子邮箱地址" id="email">
</li>
<li>
<label><span>*</span>密码：</label>
<input type="password" name="pwd" placeholder="由字母开头,包含字母、数字、下划线,6-16位" id="pwd">
</li>
<li>
<label><span>*</span>确认密码：</label>
<input type="password" name="pwdOk" placeholder="确认密码必须与密码一致" id="pwdOK">
</li>
</ul>
<button name="submit">提交</button>
</form>
</div>
<script>
</script>
</body>
</html>
```
```____
