<html>
<head>
<link rel="stylesheet" href="https://libs.baidu.com/jquerymobile/1.4.2/jquery.mobile.min.css">
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script src="https://libs.baidu.com/jquerymobile/1.4.2/jquery.mobile.min.js"></script>
</head>
<body>
<div data-role="page">
<div data-role="header">
<h1>选择菜单</h1>
</div>
<div data-role="content">
<form method="post" action="demoform.asp">
<fieldset data-role="fieldcontain">
<label for="day">选择天</label>
<select name="day" id="day">
<optgroup label="工作日">
<option value="mon">星期一</option>
<option value="tue">星期二</option>
<option value="wed">星期三</option>
<option value="thu">星期四</option>
<option value="fri">星期五</option>
</optgroup>
<optgroup label="周末">
<option value="sat">星期六</option>
<option value="sun">星期日</option>
</optgroup>
</select>
</fieldset>
<input type="submit" data-inline="true" value="提交">
</form>
</div>
</div>
</body>
</html>