JS中event.target与currentTarget的区别详解

 
<div id="outer" style="background:#099">
click outer
<p id="inner" style="background:#9C0">click inner</p>
<br>
</div>
<script type="text/javascript">
function G(id){
return document.getElementById(id);
} 
function addEvent(obj, ev, handler){
if(window.attachEvent){
obj.attachEvent("on" + ev, handler);
}else if(window.addEventListener){
obj.addEventListener(ev, handler, false);
} 
} 
function test(e){
alert("e.target.tagName : " + e.target.tagName + "\n e.currentTarget.tagName : " + e.currentTarget.tagName);
} 
var outer = G("outer");
var inner = G("inner");
//addEvent(inner, "click", test);
addEvent(outer, "click", test);
</script>

target与currentTarget的行为分析

在上述示例中，当点击outer元素时，e.target与e.currentTarget均指向div元素；而当点击inner元素时，e.target指向p元素，e.currentTarget则仍指向div元素。