日期:2014-05-17  浏览次数:20728 次

不常用的HTML代码
<html>
<head>
</head>
<body>
<select>  
<optgroup label="Swedish Cars">  
<option value ="volvo">Volvo</option>  
<option value ="saab">Saab</option>  
</optgroup>  
<optgroup label="German Cars">  
<option value ="mercedes">Mercedes</option>  
<option value ="audi">Audi</option>  
</optgroup>  
</select>
<body>
</html>