<div class="control-group">
<label class="control-label">用户密码</label>
<div class="controls">
<input type="password" class="span3 disabled" id="pwd"
placeholder="输入修改密码,不输入则默认不修改" maxlength="25" disabled="true" style="display:none"/>
<input type="password" class="span3 disabled" id="pwd"
name="pwd" placeholder="输入修改密码,不输入则默认不修改" maxlength="25" autocomplete="off" />
</div>
<!-- /controls -->
</div>
重点是：在所需控件前面添加一个id相同的input，然后设置属性：disabled="true"及style="display:none"