事件委托与阻止冒泡

<ul class="clearfix" data-type="cityPick">
						<li class="active_sort_opts" data-id="0">全部</li>
						<li data-id="88">纽约</li>
						<li data-id="119">洛杉矶</li>
						<li data-id="138">拉斯维加斯</li>
						<li data-id="84">夏威夷</li>
						<li data-id="120">旧金山</li>
						<li data-id="105">奥兰多</li>
						<li data-id="118">西雅图</li>
					</ul>

$("ul[data-type='cityPick']").on('click',function(){
	alert("父元素ul被点击");
});
$("ul[data-type='cityPick']").on('click','li',function(){
	alert("子元素li被点击");
});

$("ul[data-type='cityPick']").on('click',function(){
	alert("父元素ul被点击");
});
$("ul[data-type='cityPick']").on('click','li',function(e){
	e.stopPropagation();//阻止冒泡
	alert("子元素li被点击");
});