e.target与e.currentTarget对比

复制以下代码，即可查看效果

<!DOCTYPE html>  
<html>  
<head lang="en">  
    <meta charset="UTF-8">  
    <title></title>  
    <style type="text/css" rel="stylesheet">  
       #father{  
            width: 200px;  
            height: 120px;  
            padding: 20px;  
            background-color: #ccc;  
        }  
        #son{  
            width: 100%;  
            height: 20px;  
            padding: 30px 0px;  
            background-color: #000;  
            color: white;  
            text-align: center;  
            cursor: pointer;  
        } 
    </style>  
</head>  
<body>  
<div id="father" onmousedown="getEventTrigger(event)">  
    <p id="son" onmousedown="getEventTrigger(event)">点击查看效果</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>