基于jQuery插件jqzoom实现的图片放大镜效果示例

<script src="/js/common/jquery-1.6.2.js" type="text/javascript"></script><script src="/js/common/jquery.jqzoom.js" type="text/javascript"></script>

/*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/shopping/zoomlens.gif) 50% top no-repeat;  opacity: 0.5;  -moz-opacity: 0.5;  -khtml-opacity: 0.5;  filter: alpha(Opacity=50);}

<div class="jqzoom">  <img src="/images/shopping/pro_img/blue_one_small.jpg" style="width:300px; height:300px;" alt="" jqimg="/images/shopping/pro_img/blue_one_big.jpg" id="bigImg"/></div>

/*使用jqzoom*/$(function() {  $(".jqzoom").jqueryzoom({    xzoom: 300, //放大图的宽度(默认是 200)    yzoom: 300, //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  });});

//**************************************************************// 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("<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;}