1 target在事件流的目标阶段;currentTarget在事件流的捕获,目标及冒泡阶段。

只有当事件流处在目标阶段的时候,两个的指向才是一样的;

而当处于捕获和冒泡阶段的时候,target指向被单击的对象而currentTarget指向当前事件活动的对象(一般为父级)。

2 HTML

<body>
<form id="form1" runat="server">
<div id="outer" style="background: #099">
        click outer
<p id="inner" style="background: #9C0">
            click inner</p>
<br>
</div>
<script language ="javascript">
        var outer = G("outer");
        var inner = G("inner");
        addEvent(inner, "click", test);
        addEvent(outer, "click", test);
</script>
</form>
</body>

 3 javascript

<script language="javascript" defer="defer">
        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);
        }
</script>

 4 结果

点击 “inner”

先出现

`后出现:

e.target.tagname:P(冒泡阶段)

e.currentTarget.tagname:Div(冒泡阶段)

点击 "outer"

e.target.tagname:Div(目标阶段)

e.currentTarget.tagname:Div(目标阶段)

5 执行的部分脚本放在Dom 定义之后才能加载实现

var outer = G("outer");
        var inner = G("inner");

6 可以<body onload =mytest();>

定义函数

function mytest() 
        {
        var outer = G("outer");
        var inner = G("inner");
        addEvent(inner, "click", test);
        addEvent(outer, "click", test);
    }

7 如果用jQuery 可以这样:

$(function() {
            var outer = G("outer");
            var inner = G("inner");
            addEvent(inner, "click", test);
           addEvent(outer, "click", test);
           })