鼠标滚轮改变图片大小的示例代码

<script>

function onWheelZoom(obj){

zoom = parseFloat(obj.style.zoom);

tZoom = zoom + (event.wheelDelta>0 ? 0.05 : -0.05);

if( tZoom > 1 || tZoom<0.1 ) return true;

obj.style.zoom=tZoom;

return false;

}

</script>

<a href="javascript:window.close()"><img

src="http://files.jb51.net/file_images/article/201311/20131120101711.png"

onmousewheel='return onWheelZoom(this)'></a>