javascript 实现的完全兼容鼠标滚轴缩放图片的代码

时间:2020-05-12 人气:0

code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,'\5b8b\4f53','\5FAE\8F6F\96C5\9ED1',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> 
<img onerror="javascript:this.src='/skin1/img/error.jpg';" src="https://img.qb5200.com/download-x/20200512/28916.jpg" id="testimg1" alt="sohighthesky"/> 
<div>默认最小缩放为原图片的50%</div> 
<div><a href="https://m.qb5200.com/www.qb5200.com"></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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