jQuery jqzoom（放大镜）

HTML代码：

 <div class="jqzoom">
                    <img src="images/pro_img/blue_one_small.jpg" class="fs" alt="" jqimg="images/pro_img/blue_one_big.jpg" id="bigImg" />
                </div>

CSS样式：

    .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);
}

jqzoom插件

//**************************************************************
// 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: [e-mail]
//**************************************************************
(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("<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');
            }
            $(document.body).mousemove(function (e) {
                mouse = new MouseEvent(e);
                /*$("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("<div style='display:none;' class='jqPreload" + count + "'>sdsdssdsd</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;
}

js代码：

$(function () { 
    $(function () {
        $(".jqzoom").jqueryzoom({
            xzoom: 400, //放大图的宽度(默认是 200)
            yzoom: 400, //放大图的高度(默认是 200)
            offset: 10, //离原图的距离(默认是 10)
            position: "right", //放大图的定位(默认是 "right")
            preload: 1
        });
    });  
})