使用Ajax、json实现京东购物车结算界面的数据交互实例

<div class="goodslist_menu">
   <div class="goodslist">
    <div class="goodslistfl">
     <input class="fl" style="margin:15px 10px 0 10px;" type="checkbox" name="" />
     <ul>
      <li>全选</li>
      <li>商品</li>
     </ul>
    </div>
    <div class="goodslistfr fr">
     <ul>
      <li>单价</li>
      <li class="w100">数量</li>
      <li class="w100">小计</li>
      <li>操作</li>
     </ul>
    </div>
   </div>
   <!--内容-->
   <div class='goodslistbox'></div>
   <div class="checkout">
    <div class="checkoutleft">
     <input class="fl" style="margin:21px 10px 0 10px;" type="checkbox" name="" />
     <ul>
      <li>全选</li>
      <li>删除选中产品</li>
     </ul>
    </div>
    <div class="checkoutright fr">
     <span>总价：<b>￥</b></span><span class="checkoutsum">0</span>
     <input type="button" value="去结算" />
    </div>
   </div>
  </div>

body,html,ul,li,a{
 margin:0;padding:0;font-family:"microsoft yahei";list-style:none;text-decoration:none;
}
.fl{
 float:left;
}
.fr{
 float:right;
}
.f12{
 font-size:12px;
}
.disl{
 display:inline-block;
}
.w100{
 width:100px;
}
.fw{
 font-weight:bold;
}
.goodslist_menu{
 width:990px;height:45px;background:#f3f3f3;margin:0 auto;line-height:45px;
 font-size:14px;color:#333;border:1px solid #ddd;
}
.goodslist_menu .goodslistfl ul li{
 float:left;margin-right:80px;cursor:pointer;
}
.goodslist_menu .goodslistfr ul li{
 float:left;margin-right:37px;text-align:center;cursor:pointer;
}
/*内容*/
.goodslist_content{
 width:100%;height:80px;border-bottom:1px solid #eee;padding:20px 0;margin-top:40px;
}
.goodslist_content .disl{
 line-height:20px;width:300px;cursor:pointer;margin-left:10px;
}
.goodslist_content .disl span:hover{
 color:#e4393c;
}
.goodslist_content .disl p:hover{
 color:#e4393c;
}
.goodslistnum .listnum{
 widows:45px;height:21px;width:50px;border:1px solid #eee;text-align:center;
 outline:none;
}
.goodslistnum ul li{
 float:left;margin-right:30px;text-align:center;cursor:pointer;
}
.goodslistnum ul li a{
 border:1px solid #ddd;padding:2px 7px;color:#000;
}
.goodslistnum ul li p{
 line-height:0;color:#666;font-size:12px;margin-top:-2px;
}
.buy_goods p{
 background:url(../images/arrow.png)no-repeat;padding-left:30px;background-position:-20px -20px;
}
.buy_goods{
 position:relative;
}
/*底部结账*/
.checkout{
 height:55px;border:1px solid #eee;margin-top:20px;line-height:55px;
}
.checkout .checkoutleft ul li{
 float:left;margin-right:10px;cursor:pointer;
}
.checkout .checkoutsum{
 font-weight:bold;font-size:18px;color:#e64346;
}
.checkout .checkoutright input{
 border:none;color:#fff;outline:none;width:100px;height:55px;line-height:55px;
 font-size:20px;background:#e64346;margin-left:50px;cursor:pointer;
}

<script>
   $.ajax({
    type:"get",
    url:"jd.json",
    datatype:"json",
    success:function(data){
     var list = data.list;//拿到list数组
     //console.log(list);
     for(var i=0;i<list.length;i++){
      var numarray = list[i];
      numarray.price = (numarray.price).tofixed(2);
      var text = "<div class='goodslist_content'><div class='fl buy_goods'>"+
         "<input class='fl' style='margin:15px 10px 0 10px;' type='checkbox' name='' />"+
         "<img align='top' src='images/1.jpg' /><div class='disl'>"+
         "<span>"+numarray.description+"</span><p class='f12'>购买礼品服务</p></div>"+
         "<div class='disl' style='width:auto;position:absolute;right:-100px;top:0;'>"+
         "<span>"+numarray.color+"</span></div></div>"+
         "<div class='fr goodslistnum' style='margin-top:-12px;'>"+
         "<ul><li><b>￥</b><span class='fw'>"+numarray.price+"</span></li>"+
         "<li class='w100'><a class='minus' onclick='minus(this);' href='javascript:void(0);'>-</a>"+
         "<input value='1' class='listnum' /><a class='add' onclick='add(this)' href='javascript:void(0);'>+</a><p>有货</p></li>"+
         "<li class='w100'><b>￥</b><span id='sub' class='fw'>"+numarray.price*numarray.quentity+"</span></li>"+
         "<li><a style='border:none;color:#666;' href='javascript:void(0);'>删除</a></li>"+
         "</ul></div></div>"
      $(text).appendto(".goodslistbox");
     }
    },
    error:function(){
     console.log("调用数据失败！");
    }
   });
   var listnum,price,sums,sub1,sub2;
   function add(obj){
    listnum = $(obj).prev().val();//input值
    listnum = parseint(listnum);
    var num = parseint(listnum+1);//input值每次+1
    $(obj).prev().val(num);
    price = $(obj).parent().prev().children('span').text();//找到单价
    price = parseint(price);//转换成number类型
    price = price.tofixed(2);
    sums = $(obj).parent().next().children('span').text()//找到总金额
    sums = parseint(sums);
    console.log(typeof sums);
    $(obj).parent().next().children('span').text(price*num);

    sub1 = $(".goodslist_content:eq(0)").find("#sub").text();
    sub2 = $(".goodslist_content:eq(1)").find("#sub").text();
    sub1 = parseint(sub1);
    sub2 = parseint(sub2);
    var res = $(".checkoutright .checkoutsum").text((sub1+sub2).tofixed(2));
   }
   
   function minus(obj){
    listnum = $(obj).next().val();
    listnum = parseint(listnum);
    if(listnum<=1){
     listnum==1;
    }else{
     --listnum;
    }
    $(obj).next().val(listnum);
    price = $(obj).parent().prev().children('span').text();//找到单价
    price = parseint(price);//转换成number类型
    price = price.tofixed(2);
    sums = $(obj).parent().next().children('span').text()//找到总金额
    sums = parseint(sums);
    $(obj).parent().next().children('span').text(price*listnum);
    $(".checkoutright .checkoutsum").text(price*listnum);
    sub1 = $(".goodslist_content:eq(0)").find("#sub").text();
    sub2 = $(".goodslist_content:eq(1)").find("#sub").text();
    sub1 = parseint(sub1);
    sub2 = parseint(sub2);
    $(".checkoutright .checkoutsum").text(sub1+sub2);
   }
  </script>