代码：
复制代码 代码如下:
/*
*
* JQUERY 之简易放大镜插件-JNMagnifier
* Author:翅膀的初衷
* QQ:4585839
* Date:2011-11-16
*
*/
(function($){
$.fn.JNMagnifier=function(setting){
if(setting&&setting.renderTo){
if(typeof(setting.renderTo)=="string"){
setting.renderTo = $(setting.renderTo);
}
}else{
return;
}
var _img_org_ = this.children("img");
_img_org_.css("cursor","pointer");
var __w = 0;
var __h = 0;
var __left = this.offset().left;
var __top = this.offset().top;
if(this.offsetParent())
{
__left+=this.offsetParent().offset().left;
__top+=this.offsetParent().offset().top;
}
var _move_x = 0;
var _move_y = 0;
var _val_w = (setting.renderTo.width() / 2);
var _val_h = (setting.renderTo.height() / 2);
_img_org_.mouseover(function(){
setting.renderTo.html('<img src="/UploadFiles/2021-04-02/' + _img_org_.attr(">setting.renderTo.show();
var timer = setInterval(function(){
__w = $("#JNMagnifierrenderToImg").width() / _img_org_.width();
__h = $("#JNMagnifierrenderToImg").height() /_img_org_.height();
if(__w>0){
clearInterval(timer);
}
},100);
});
_img_org_.mouseout(function(){
setting.renderTo.hide();
});
_img_org_.mousemove(function(e){
_move_x =0-Math.round((document.documentElement.scrollLeft+e.clientX-__left) * __w - _val_w);
_move_y =0-Math.round((document.documentElement.scrollTop+e.clientY-__top) * __h - _val_h);
$("#JNMagnifierrenderToImg").css({"left":_move_x + "px ","top":_move_y + "px"});
});
}
})(jQuery);

调用方法：
复制代码 代码如下:
$("#ShowPictureBox").JNMagnifier({
renderTo:"#ShowBigPictureBox"
});

ＨＴＭＬ
复制代码 代码如下:
<div id="ShowPictureBox">
　　<img src="/UploadFiles/2021-04-02/图片"></div>
<div id="ShowBigPictureBox" style=" position:absolute; overflow:hidden; display:none; border:3px solid #ccc; padding:5px; background-repeat:no-repeat; background-color:#fff; width:300px; height:300px;">
<!--这里显示放大效果-->
</div>

注意事项：
这里没有使用两张图片，只用了一张图，图片为大图，长宽必须大于放大效果ＤＩＶ的大小！默认放大倍数为原图与显示小图之间的倍数，如果需要控制放大倍数，可以手动的为“_img_org_.mouseover”　事件中的图片设定对应的长宽就可以实现