鼠标滚轮程序以及CSS的zoom属性范例

<img src='http://www.lshdic.com/bbs/image/mu.jpg' onmousewheel='alert("滚轮值"+event.wheelDelta)' onclick='this.style.zoom=parseInt(this.style.zoom)+1' oncontextmenu='this.style.zoom=parseInt(this.style.zoom)-1;return false'id=a style='position:absolute;zoom:1' title='左键单击放大1倍,右键单击缩小1倍,鼠标滚轮控制'>
<script>
top1=0;
function document.onmousewheel(){
if(event.wheelDelta>0)top1-=10;else top1+=10
a.style.top=top1
}
</script>