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        <title>菜鸟教程(runoob.com)</title> 
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            <h2>按钮</h2>
            <p> disabled 属性可制作一个禁用的按钮：</p>            
            <button type="button" class="btn btn-default" disabled="disabled">禁用的默认按钮</button>
            <br><br>
            <p> .disabled 类使得链接不可用:</p>                  
            <a href="#" class="btn btn-info disabled" role="button">禁用的信息链接</a>      
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