jQuery图片放大功能

备份而已，测试OK。

1. 引用jQuery API
<script type="text/javascript" src="http://www.cnblogs.com/../js/jquery-1.4.4.min.js"></script>

2. 加入样式
<style type="text/css">
   #preview {float:left; margin:10px auto; text-align:center; 200px;}
   .jqzoom {200px; height:180px; position:relative;margin:0 0 0 10px;}
   .jqzoom img{ 200px; height:180px; float:left;border:#1a1f5b 3px solid;}
   .zoomdiv {left:1000px; height:600px; 600px;}
   .list-h li {float:left;}
   /*jqzoom*/
   .zoomdiv{z-index:100;position:absolute;top:1px;left:0px;250px;height:250px;border:1px solid #e4e4e4;display:none;text-align:center;overflow: hidden;}
   .jqZoomPup{z-index:10;visibility:hidden;position:absolute;top:0px;left:0px;30px;height:30px;border:1px solid #aaa;background:#FEDE4F 50% top no-repeat;opacity:0.5;-moz-opacity:0.5;-khtml-opacity:0.5;filter:alpha(Opacity=50);cursor:move;}
</style>

3. 定义jQuery 方法用于放大图片
<SCRIPT type="text/javascript">
(function($){
    $.fn.jqueryzoom=function(options){
    var settings={
    xzoom:200,
    yzoom:200,
    offset:10,
    position:"right",
    lens:1,
    preload:1};
    if(options){
    $.extend(settings,options);}
    var noalt='';
    $(this).hover(function(){
    var imageLeft=$(this).offset().left;
    var imageTop=$(this).offset().top;
    var imageWidth=$(this).children('img').get(0).offsetWidth;
    var imageHeight=$(this).children('img').get(0).offsetHeight;
    noalt=$(this).children("img").attr("alt");
    var bigimage=$(this).children("img").attr("jqimg");
    $(this).children("img").attr("alt",'');
    if($("div.zoomdiv").get().length==0){
    $(this).after("<div class='zoomdiv'><img class='bigimg' src='"+bigimage+"'/></div>");
    $(this).append("<div class='jqZoomPup'> </div>");}
    if(settings.position=="right"){
    if(imageLeft+imageWidth+settings.offset+settings.xzoom>screen.width){
    leftpos=imageLeft-settings.offset-settings.xzoom;}else{
    leftpos=imageLeft+imageWidth+settings.offset;}}else{
    leftpos=imageLeft-settings.xzoom-settings.offset;
    if(leftpos<0){
    leftpos=imageLeft+imageWidth+settings.offset;}}
    $("div.zoomdiv").css({top:imageTop,left:leftpos});
    $("div.zoomdiv").width(settings.xzoom);
    $("div.zoomdiv").height(settings.yzoom);
    $("div.zoomdiv").show();
    if(!settings.lens){
    $(this).css('cursor','crosshair');}
    $(document.body).mousemove(function(e){
    mouse=new MouseEvent(e);
    var bigwidth=$(".bigimg").get(0).offsetWidth;
    var bigheight=$(".bigimg").get(0).offsetHeight;
    var scaley='x';
    var scalex='y';
    if(isNaN(scalex)|isNaN(scaley)){
    var scalex=(bigwidth/imageWidth);
    var scaley=(bigheight/imageHeight);
    $("div.jqZoomPup").width((settings.xzoom)/(scalex*1));
    $("div.jqZoomPup").height((settings.yzoom)/(scaley*1));
    if(settings.lens){
    $("div.jqZoomPup").css('visibility','visible');}}
    xpos=mouse.x-$("div.jqZoomPup").width()/2-imageLeft;
    ypos=mouse.y-$("div.jqZoomPup").height()/2-imageTop;
    if(settings.lens){
    xpos=(mouse.x-$("div.jqZoomPup").width()/2 < imageLeft ) ? 0 : (mouse.x + $("div.jqZoomPup").width()/2>imageWidth+imageLeft)?(imageWidth-$("div.jqZoomPup").width()-2):xpos;
    ypos=(mouse.y-$("div.jqZoomPup").height()/2 < imageTop ) ? 0 : (mouse.y + $("div.jqZoomPup").height()/2>imageHeight+imageTop)?(imageHeight-$("div.jqZoomPup").height()-2):ypos;}
    if(settings.lens){
    $("div.jqZoomPup").css({top:ypos,left:xpos});}
    scrolly=ypos;
    $("div.zoomdiv").get(0).scrollTop=scrolly*scaley;
    scrollx=xpos;
    $("div.zoomdiv").get(0).scrollLeft=(scrollx)*scalex;});},function(){
    $(this).children("img").attr("alt",noalt);
    $(document.body).unbind("mousemove");
    if(settings.lens){
    $("div.jqZoomPup").remove();}
    $("div.zoomdiv").remove();});
    count=0;
    if(settings.preload){
    $('body').append("<div style='display:none;' class='jqPreload"+count+"'>360buy</div>");
    $(this).each(function(){
    var imagetopreload=$(this).children("img").attr("jqimg");
    var content=jQuery('div.jqPreload'+count+'').html();
    jQuery('div.jqPreload'+count+'').html(content+'<img src=\"'+imagetopreload+'\">');});}}})(jQuery);
    function MouseEvent(e){
    this.x=e.pageX;
    this.y=e.pageY;}


   $(function(){
$(".jqzoom").jqueryzoom({
xzoom:460,
yzoom:460,
offset:10,
position:"right",
preload:1,
lens:1
});
})
</SCRIPT>

3. 在拷贝了一段HTML代码，算帮他们做个广告吧，呵呵。
<div id="preview">
<div class="jqzoom">

<img height="350" width="350" jqimg="http://img14.360buyimg.com/n0/g3/M00/06/10/rBEGFFASlZUIAAAAAAFyUgRSq28AABRcwMOSOUAAXJq619.jpg" alt="INMAN茵曼2012秋装新款宽松休闲大码纯棉翻领女式衬衫823041676 翡翠绿 XL" src="http://img14.360buyimg.com/n1/g3/M00/06/10/rBEGFFASlZUIAAAAAAFyUgRSq28AABRcwMOSOUAAXJq619.jpg" onerror="this.src='http://www.360buy.com/images/none/none_347.gif'">
</div>
</div>