<script language="javascript">
document.getElementById("result").οnclick=function(){document.getElementById("result").innerText="動態添加事件";};
</script>

<script language="javascript">
function aEvent() {
var oBtn = document.all['oBtn'];
?????????? oBtn.attachEvent('onclick', sText);
????? }
function dEvent() {
var oBtn = document.all['oBtn'];
?????????? oBtn.detachEvent('onclick', sText);??????????
????? }
function sText() {
?????????? window.alert('看到效果了嗎^^');
????? }
</script>
<button id="oBtn">點擊我查看效果</button>
<button οnclick="aEvent();">添加事件</button>
<button οnclick="dEvent();">取消事件</button>