JS target与currentTarget区别说明

<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>

上面的示例中，当在outer上点击时，e.target与e.currentTarget是一样的，都是div；当在inner上点击时，e.target是p，而e.currentTarget则是div。