jQuery 中 on 方法-----给未来元素添加事件

<li class='clear dir-li'>
<div class='left title'>添加到目录：</div>
<div class='left item' id='dir-ctrl-dv'>
<if condition="$dirs neq ''">
<select act-v='1' act="{:U('Content/getDirs')}" class='input dir-ctrl select' title='目录' name="dir">
<option value="0">请选择目录</option>
<foreach name='dirs' item='v'>
<option value="{$v}">{:str_replace('../','',$v)}</option>
</foreach>
</select>

<select act-v='1' act="{:U('Content/getDirs')}" class='input dir-ctrl select' title='目录' name="dir">
<option value="0">请选择目录</option>
<foreach name='dirs' item='v'>
<option value="{$v}">{:str_replace('../','',$v)}</option>
</foreach>
</select>

</div>
</li>

$(".dir-li #dir-ctrl-dv").on('change','.dir-ctrl',function () {
#....code
}