jqzoom插件实现图片放大镜效果

1. jquery.jqzoom.js

//**************************************************************// jQZoom allows you to realize a small magnifier window,close// to the image or images on your web page easily.//// jqZoom version 2.2// Author Doc. Ing. Renzi Marco(www.mind-projects.it)// First Release on Dec 05 2007// i'm looking for a job,pick me up!!!// mail: renzi.mrc@gmail.com//**************************************************************(function ($) {    $.fn.jqueryzoom = function (options) {        var settings = {            xzoom: 200,        //zoomed width default width            yzoom: 200,        //zoomed div default width            offset: 10,        //zoomed div default offset            position: "right",//zoomed div default position,offset position is to the right of the image            lens: 1, //zooming lens over the image,by default is 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("
     
      
     
");                $(this).append("
     
       
     
");            }            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');            }            $(document.body).mousemove(function (e) {                mouse = new MouseEvent(e);                /*$("div.jqZoomPup").hide();*/                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);                    $("div.jqZoomPup").height((settings.yzoom) / scaley);                    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("
     
      sdsdssdsd
     
");            $(this).each(function () {                var imagetopreload = $(this).children("img").attr("jqimg");                var content = jQuery('div.jqPreload' + count + '').html();                jQuery('div.jqPreload' + count + '').html(content + '');            });        }    }})(jQuery);function MouseEvent(e) {    this.x = e.pageX;    this.y = e.pageY;}

2. jqzoom.css

/*jQzoom*/.jqzoom{
       border:1px solid #BBB;    float:left;    position:relative;    padding:0px;    cursor:pointer;}div.zoomdiv {
       z-index:    999;    position                : absolute;    top:0px;    left:0px;    width                   : 200px;    height                  : 200px;    background: #ffffff;    border:1px solid #CCCCCC;    display:none;    text-align: center;    overflow: hidden;}div.jqZoomPup {
       z-index                 : 999;    visibility              : hidden;    position                : absolute;    top:0px;    left:0px;    width                   : 50px;    height                  : 50px;    border: 1px solid #aaa;    background: #ffffff url(../images/zoomlens.gif) 50% top  no-repeat;    opacity: 0.5;    -moz-opacity: 0.5;    -khtml-opacity: 0.5;    filter: alpha(Opacity=50);}

3. html代码

附件：放大镜图标（zoomlens.gif）