<li branch="news" class="branch open">News Management
<ul style="display: block;">
<li leafid="4" class="leaf">5 Myths That Can Kill a Startup</li>
<li leafid="5" class="leaf">How to set up a Facebook fan page that works</li>
<li leafid="6" class="leaf">World's tallest tower opens in debt-hit Dubai</li>
</ul>
</li>


$('li.branch').click(function(event) {
    //如果event是由于点击内部的li生成的，则不处理
    if($(event.target).??)
    {
        //是点击News Management产生的，进行相应处理
    }
})

这里面的??该如何实现呢？