javascript 实现的完全兼容鼠标滚轴缩放图片的代码

 
/*! 
*author:sohighthesky 
*blog:http://www.cnblogs.com/sohighthesky 
*date:2010-2-4 
*/ 
var zooming=function(e){ 
e=window.event ||e; 
var o=this,data=e.wheelDelta || e.detail*40,zoom,size; 
if(!+'v1'){ 
zoom = parseInt(o.style.zoom) || 100; 
zoom += data / 12; 
if(zoom > zooming.min) 
o.style.zoom = zoom + '%'; 
}else { 
size=o.getAttribute("_zoomsize").split(","); 
zoom=parseInt(o.getAttribute("_zoom")) ||100; 
zoom+=data/12; 
if(zoom>zooming.min){ 
o.setAttribute("_zoom",zoom); 
o.style.width=size[0]*zoom/100+"px"; 
o.style.height=size[1]*zoom/100+"px"; 
} 
} 
}; 
zooming.add=function(obj,min){//第一个参数指定可以缩放的图片，min指定最小缩放的大小 ,default to 50 
zooming.min=min || 50; 
obj.onmousewheel=zooming; 
if(/a/[-1]=='a')//if Firefox 
obj.addEventListener("DOMMouseScroll",zooming,false); 
if(-[1,]){//if not IE 
obj.setAttribute("_zoomsize",obj.offsetWidth+","+obj.offsetHeight); 
} 
}; 

window.onload=function(){//放在onload中，否则非ie中会无法计算图片大小出错 
zooming.add(document.getElementById("testimg1")); 
}