jquery仿京东商品放大浏览页面

*{  margin: 0;  padding: 0;}.da{  width: 360px;  height: 418px;  float: left;}.shang{  width: 350px;  height: 350px;  border: 1px solid #ccc;  margin: 10px 0 10px 10px;  position: relative;}.yin{  width: 150px;  height: 150px;  border: 1px solid #ccc;  background: rgba(255,255,255,0.3);  position: absolute;  top:0;  left: 0;  cursor: pointer;  display: none;}.bao{  width: 362px;  height: 56px;}.tab{  width: 320px;  height: 56px;  margin-left: 10px;  overflow: hidden;}.Ul{  width: 9999px;  height: 56px;}.Ul li{  width: 52px;  height: 52px;  float: left;  border: 2px solid #ccc;  margin-left: 8px;  list-style: none;  position:relative;  text-align:center;}.li{  width: 52px;  height: 52px;  border: 2px solid #FF7403;}.li img{  display: block;  position: absolute;  top:50%;  left: 50%;  margin-top:-26px;  margin-left:-26px;}.zuo{  display: block;  width: 12px;  height: 56px;  background: url(../img/icon_clubs.gif) no-repeat;  background-size: 180px 608px;  background-position: -82px -462px;  float: left;  margin-left: 10px;}.you{  display: block;  width: 12px;  height: 56px;  background: url(../img/icon_clubs.gif) no-repeat;  background-size: 180px 608px;  background-position: -95px -462px;  float: right;  margin-top: -56px;}.xia{  width: 360px;  height: 418px;  border: 1px solid #ccc;  float: left;  margin: 10px 0 0px 20px;  overflow: hidden;  display: none;}.lie{  width: 1329px;  height: 30px;  margin-left: 10px;  margin-top: 20px;  border-bottom: 2px solid #BE0000;}.lie li{  float: left;  list-style: none;  width: 80px;  height: 28px;  background: #fff;  border-radius: 3px;  border: 0;  line-height: 30px;  text-align: center;  margin-right: 5px;  border:1px solid #BE0000;  color: #c30;  cursor: pointer;  font-weight: bold;}.lie>ul .ll{  width: 80px;  height: 30px;  background: #BE0000;  border-radius: 3px;  border: 0;  line-height: 30px;  text-align: center;  color: #fff;  cursor: pointer;}.nie{  width: 1329px;  height: 200px;  margin-left: 10px;  overflow: hidden;}.bao1{  width: 1329px;  height: 500px;}.up{  width: 1329px;  height: 200px; }.up span{  display: block;  padding:10px 0 0 10px;  margin-bottom: 70px;}.up p{  text-align: center;  margin-top: 5px;}.down{  width: 1329px;  height: 300px;   background: yellow;}

<div>  <div class="da ">  <div class="shang">    <img src="img/b1.jpg" height="350" width="350" id="pian">    <div class="yin"></div>  </div>  <div class="bao">    <span class="zuo"></span>      <div class="tab">      <ul class="Ul">        <li>          <img src="img/b1.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b2.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b3.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b1.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b2.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b3.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b1.jpg" height="52" width="52" />        </li>        <li>          <img src="img/b2.jpg" height="52" width="52" />        </li>      </ul>    </div>      <span class="you"></span>    </div>    <div class="lie ">      <ul>        <li class="ll">图文介绍</li>        <li>评论（1）</li>      </ul>    </div>      <div class="nie">      <div class="bao1">        <div class="up">          <span>暂无好评！</span>          <p>适用浏览器：IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗</p>          <p>来源：师徒课堂</p>        </div>        <div class="down">          <img src="img/11.png" height="300" width="1329" />        </div>      </div>    </div>  </div>  <div class="xia">    <img src="img/b1.jpg" height="600" width="600" id="zhao" />  </div></div>

$(function(){  var $yin = $(".yin");  $(".Ul li img").mouseover(function(){    $(this).parent().addClass("li").siblings().removeClass("li");    $("#pian").attr("src",$(this).attr("src"));    $("#zhao").attr("src",$(this).attr("src"));  }).mouseout(function(){    $(this).parent().removeClass("li");  });  var l = $(".shang").eq(0).offset().left;  var t = $(".shang").eq(0).offset().top;  var width1 = $(".yin").outerWidth()/2;  var height1 = $(".yin").outerHeight()/2;  var maxL = $(".shang").width() - $yin.outerWidth();  var maxT = $(".shang").height() - $yin.outerHeight();  var bili = $("#zhao").width()/$("#pian").width();  $(".shang").mousemove(function(e){    var maskL = e.clientX - l - width1,maskT = e.clientY - t - height1;    if (maskL < 0) { maskL = 0};    if (maskT < 0) { maskT = 0};    if (maskL > maxL) {maskL = maxL};    if (maskT > maxT) {maskT = maxT};    $yin.css({"left":maskL,"top":maskT});    $(".xia").show();    $(".yin").show();    $("#zhao").css({"margin-left":-maskL*bili,"margin-top":-maskT*bili});  });  $(".shang").mouseleave(function(){    $(".xia").hide();    $(".yin").hide();  });  var marginLeft = 0;  $(".you").click(function(){    marginLeft = marginLeft - 64;    if (marginLeft < -192) {marginLeft = -192};    $(".tab ul").stop().animate({"margin-left":marginLeft},"fast");  });  $(".zuo").click(function(){    marginLeft = marginLeft + 64;    if (marginLeft > 0) {marginLeft = 0};    $(".tab ul").stop().animate({"margin-left":marginLeft},"fast");  });  $(".lie li").click(function(){    var index=$(this).index();    $(this).addClass("ll").siblings().removeClass("ll");     $(".bao1>div").eq(index).show().siblings().hide();  });});