<p>event對象指當前觸發的事件對象, window.event.srcElement是指觸發事件的對象。比如你設定document.onclick = myfunc;這時所有頁面點擊的事件都交給myfunc處理，在myfunc函數裡可以寫vSrc = window.event.srcElement，知道使用者是點擊了什麼地方，做相應處理。
你找個HTML檔案，在其中加上這麼一段：</p>
<p>
<textarea rows="10" cols="90">
<script languange = "javascript">
document.onclick = myfunc;
function myfunc()
{
alert(window.event.srcElement.tagName);
}
</script>
</textarea>
<script languange = "javascript">
document.onclick = myfunc;
function myfunc()
{
alert(window.event.srcElement.tagName);
}
</script>
</p>
<p>試試就知道了。 <a href=#>void(0)是一個不做任何事的函數。</a>
</p>
</body>
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