javascript 事件模型

*****************IE中的event********************************

<script type="text/javascript">
function mouseDown(){
var localstring="X="+window.event.screenX+"  Y="+window.event.screenY;
alert(localstring);
}
document.onmousedown=mouseDown;
</script>

**************************非IE中的event********************************

 

<script type="text/javascript">
function mouseDown(ev){
var localstring="X="+ev.screenX+"  Y="+ev.screenY;
alert(localstring);
}
document.onmousedown=mouseDown;
</script>

*************************为div元素添加时间********************************************

<script type="text/javascript">
function dd(){
document.getElementById("ln").onmousedown=function(){
alert("good");
}
}
</script>