target在事件流的目标階段；currentTarget在事件流的捕獲，目标及冒泡階段。隻有當事件流處在目标階段的時候，兩個的指向才是一樣的， 而當處于捕獲和冒泡階段的時候，target指向被單擊的對象而currentTarget指向目前事件活動的對象(注冊該事件的對象)（一般為父級）。this指向永遠和currentTarget指向一緻（隻考慮this的普通函數調用）。
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style type="text/css" rel="stylesheet">
#fa{
width: %;
height: px;
padding: px px;
background-color: cadetblue;
}
#son{
width: %;
height: px;
padding: px px;
background-color: black;
color: white;
text-align: center;
cursor: pointer;
}
</style>
</head>
<body>
<div id="fa" onmousedown="getEventTrigger(event)">
<p id="son" onmousedown="getEventTrigger(event)">點我試試</p>
</div>
</body>
<script type="text/javascript">
var fa = document.getElementById('fa');
var son = document.getElementById('son');
function getEventTrigger(event)
{
x=event.currentTarget;
y=event.target;
alert("currentTarget 指向： " + x.id + "， target指向：" + y.id);
}
</script>
</html>
資料來源：
http://blog.csdn.net/wkyseo/article/details/51863483
http://blog.csdn.net/magic__man/article/details/51781425
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