- 除了IE 先捕获 -> 当前节点事件 -> 后冒泡
<div id="parent" onclick="alert(99)">测试不阻止事件冒泡
<button id="child" onclick="alert(4)">我是内部div</button>
</div>
//js
document.body.addEventListener("click",function(event){
alert("event bubble");
},false);
document.body.addEventListener("click",function(event){
alert("event catch");
},true);
点击parent : event catch -> 99 ->event bubble
点击child: event catch -> 4 -> 99 ->event bubble