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實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool在线教程(w3cschool.cn)</title>
<script>
function whichElement(e){
    var targ;
    if (!e){
        var e=window.event;
    }if (e.target){
        targ=e.target;
    }else if (e.srcElement){
        targ=e.srcElement;
    }
    var tname;
    tname=targ.tagName;
    alert("你点击了一个" + tname + " 元素。");
}
</script>
</head>
<body onmousedown="whichElement(event)">
<p>单击文档中的某个地方。一个警告框将提醒你点击的元素的名称。</p>
<h3>这是一个标题</h3>
<img border="0" src="smiley.gif" alt="Smiley" width="32" height="32">
<p>这是一个段落</p>
</body>
</html>
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