问Jquery动态更新值

EN

<ul id="dropdown1" class="ddm">
<li>First</li>
<li>Second</li>
<li>Third</li>
<li>Fourth</li>
</ul>

<ul id="dropdown2" class="ddm">
<li>First</li>
<li>Second</li>
<li>Third</li>
<li>Fourth</li>
</ul>

$('.ddm li').click(function() {
    var me = $(this);
    var txt = me.text();
    var id = me.parent().attr('id');
    $('.ddm').not('#' + id + '').each(function(i) {
    $('li:contains(' + txt + ')', this).remove();
    });
});