我使用最简单的就直接使用onmousewheel命令了
代码如下 复制代码
<script language="JavaScript">
<!--
//改变图片大小
function resizepic(thispic){
if(thispic.width>700) thispic.width=700;
}
//无级缩放图片大小
function bbimg(o){
var zoom=parseInt(o.style.zoom,10)||100;
zoom+=event.wheelDelta/12;
if(zoom>0) o.style.zoom=zoom+'%';
return false;
}
-->
</script>
<img src="/images/zhanghanyun.jpg" width="320" height="240" border="0" onload="javascript:resizepic(this)" onmousewheel="return bbimg(this)">
例1
IE6-8,FF,Chrome,Opera,Safari都可使用哦。
代码如下 复制代码
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.getElementByIdx_x("testimg1"));
}
例2
代码如下 复制代码
<html>
<script type="text/javascript">
function resizeimg(ImgD,iwidth,iheight) {
var image=new Image();
image.src=ImgD.src;
if(image.width>0 && image.height>0){
if(image.width/image.height>= iwidth/iheight){
if(image.width>iwidth){
ImgD.width=iwidth;
ImgD.height=(image.height*iwidth)/image.width;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt=image.width+"×"+image.height;
}
else{
if(image.height>iheight){
ImgD.height=iheight;
ImgD.width=(image.width*iheight)/image.height;
}else{
ImgD.width=image.width;
ImgD.height=image.height;
}
ImgD.alt=image.width+"×"+image.height;
}
ImgD.style.cursor= "pointer"; //改变鼠标指针
if (navigator.userAgent.toLowerCase().indexOf("ie") > -1) { //判断浏览器，如果是IE
ImgD.title = "请使用鼠标滚轮缩放图片";
ImgD.onmousewheel = function img_zoom() //滚轮缩放
{
var zoom = parseInt(this.style.zoom, 10) || 100;
zoom += event.wheelDelta / 12;
if (zoom> 0) this.style.zoom = zoom + "%";
return false;
}
}
}
}
</script>
<body>
示例：
<img alt="" src="部门ID对照表.jpg" onload="resizeimg(this,this.width,this.height);" />
</body>
</html>
