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javascript 实现的完全兼容鼠标滚轴缩放图片的代码

  作者：bea

code如下： 代码如下: /*! *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
code如下：


代码如下:


/*!
*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"));
}


演示代码



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>鼠标滚动缩放图片</title>
<meta name="author" content="sohighthesky"/>
<meta name="Keywords" content="鼠标滚动缩放图片，兼容IE,FF,Chrome,Safari,Opera">
<style type="text/css">
/* pre style*/
body,th,td {font-size:12px;font-family:Verdana,Tahoma,Arial,'5b8b4f53','5FAE8F6F96C59ED1',sans-serif;}
body,th,td,ol,ul,li,dl,dt,dd,h1,h2,h3,h4,h5,h6,pre,form,fieldset,legend,input,button,textarea,p {margin:0;padding:0;}
li { list-style-type:none;}
a {color:#3366CC; text-decoration:none;}
a:hover {color:#FF6600;text-decoration:underline;}
/************************************************************/
#div1 {width:300px;margin:100px 35%;line-height:22px;}
</style>
</head>
<body>
<div id="div1">
<img src="http://files./upload/2010-2/20100204144849603.jpg" id="testimg1" alt="sohighthesky"/>
<div>默认最小缩放为原图片的50%</div>
<div><a href="http://"></a></div>
</div>
</body>
<script type="text/javascript">
(function(){
/*!
*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'){//IE
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"));
}
})()
</script>
</html>




[Ctrl+A 全选 注:
如需引入外部Js需刷新才能执行]

ps：因为这个页面有滚动条，所以如果直接放在页面中时，会滚动页面而不是图片，不知道有什么解决办法


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