【JavaScript&jQuery】购物车自动结算

<!doctype html>
<html lang="en">
 <head>
  <meta charset="UTF-8">
  <title>购物车</title>
  <script type="text/javascript" src="js/jquery-1.11.1.min.js"></script>
  <style>
    *{margin: 0;padding: 0}
    a{text-decoration: none;}
    ul li{float: left;list-style: none;}
    #wrapper{max-width: 640px;min-width: 320px;font-size: 12px;font-family: "微软雅黑";height: 370px;margin: 50px auto;}
    #wrapper #content{width: 100%;float: left;}
    #wrapper #content .goods_lists{width: 100%;float:left; }
    #wrapper #content .goods_lists .list{width:96%;padding: 0 2%;}
    #wrapper #content .goods_lists .list li{width: 100%;height: 100px;border: 1px solid #c7000a;margin-top: 15px;float: left;background: #fffefe;}
    .goods_lists .list li .checkbox{width: 12px;height: 12px;position: relative;border:1px solid #999 ;float: left;margin-top: 45px;margin-left: 2%;z-index: 1}
    .goods_lists .list li .checkbox .c_xz{position: absolute;top: -1px;left: 0px;width: 12px;height: 12px;display: none;}
    .goods_lists .list li .door{float: left;width: 74px;height: 74px;margin: 12px 0 0 3%;border: 1px solid #999;}
    .goods_lists .list li .l_right{width: 62%;height: 74px;float: left;margin-top: 12px;padding-left: 2%}
    .goods_lists .list li .l_right .l_r_desc{max-width: 100%;overflow: hidden;color: #555; line-height:22px;height: 22px;}
    .goods_lists .list li .l_right .price{color: #555;}
    .goods_lists .list li .l_right .price span{color: #c7000a;}
    .goods_lists .list li .l_right .old_price{text-decoration: line-through;float: left;width: 100%;color: #555}
    .goods_lists .list li .l_right .l_bot{width: 66%;height:20px;float: right; color: #555;}
    .goods_lists .list li .l_right .l_bot p{float: left;padding-top: 2px;}
    .goods_lists .list li .l_right .l_bot input{float: left;width:17%;height: 14px;text-align: center;border:1px solid #999;margin-top: 3px; }
    .goods_lists .list li .l_right .l_bot a{float: left; margin: 3px 3%;}
    .goods_lists .list li .l_right .l_bot .rubbish{margin-left: 5%;}
    #wrapper #content .checkout{float: left;width: 100%;height: 50px;background: #fffefe;border-top:1px solid #999;border-bottom: 1px solid #999;margin-top: 20px; }
    #wrapper #content .checkout .c_left{float: left;width: 47%;height: 35px;font-size: 12px;color: #555;padding-left: 3%;line-height: 50px;}
    #wrapper #content .checkout .c_left span{color: #c7000a;}
    #wrapper #content .checkout .c_right{float: left;width: 50%;height: 50px;background: #c7000a;color: #fefdfd;text-align: center;font-size: 14px;line-height: 50px;}
 </style>
 </head>
 <body>
    <div id="wrapper">
        <div id="content">
            <div class="goods_lists">
                <ul id="listbox" class="list">
                    <li>
                        <div class='checkbox'>
                            <div class='c_xz'><img src='images/checkbox.png' width='12' height='12'></div>
                        </div>
                        <a class='door' href='javascript:void(0);'><img src='images/list1.jpg' width='74' height='74' alt='阿迪达斯男鞋' /></a>
                        <div class='l_right'>
                            <p class='l_r_desc'>ADIDAS阿迪达斯 三叶草经典板鞋 ZX700跑步鞋</p>
                            <p class='price'>价格：<span>￥<span class='money'  data-money='461'>461.00</span></span></p>
                            <p class='old_price'>885.00</p>
                            <div class='l_bot'>
                                <p>数量 :</p>
                                <a class='remove' href='javascript:void(0);'><img src='images/remove.png' width='15' height='15'></a>
                                <input type='text' data-max='10' class='num' value='1' />
                                <a class='add' href='javascript:void(0);'><img src='images/add.png' width='15' height='15'></a>
                                <a class='rubbish' href='javascript:void(0);'><img src='images/rubbish.png' width='14' height='16'></a>
                            </div>
                        </div>
                    </li>
                    <li>
                        <div class='checkbox'>
                            <div class='c_xz'><img src='images/checkbox.png' width='12' height='12'></div>
                        </div>
                        <a class='door' href='javascript:void(0);'><img src='images/list2.jpg' width='74' height='74' alt='iphone6s plus' /></a>
                        <div class='l_right'>
                            <p class='l_r_desc'>Apple/苹果 iPhone 6s Plus Android6.0操作系统</p>
                            <p class='price'>价格：<span>￥<span class='money'  data-money='3999.99'>3999.99</span></span></p>
                            <p class='old_price'>5768.00</p>
                            <div class='l_bot'>
                                <p>数量 :</p>
                                <a class='remove' href='javascript:void(0);'><img src='images/remove.png' width='15' height='15'></a>
                                <input type='text' data-max='10' class='num' value='1' />
                                <a class='add' href='javascript:void(0);'><img src='images/add.png' width='15' height='15'></a>
                                <a class='rubbish' href='javascript:void(0);'><img src='images/rubbish.png' width='14' height='16'></a>
                            </div>
                        </div>
                    </li>
                </ul>
            </div>
            <div class="checkout">
                <div class="c_left">
                    合计(不含运费): <span>￥<span id="sum">0.00</span></span>
                </div>
                <a href="javascript:">
                    <div class="c_right">
                        单子（<span id="count">0</span>）
                    </div>
                </a>
            </div>
        </div>
    </div>  

    <script type="text/javascript">
        $(function(){
            //删除商品
            $("#listbox").on("click",".rubbish",function(){
                $(this).parents("li").remove();
                tm_total();
            });  

            //商品复选框的选中和不选中
            $("#listbox").on("click",".checkbox",function(){
                $(this).find(".c_xz").toggle();
                tm_total();
            });  

            //商品数量的添加和减少
            $("#listbox").on("click",".add",function(){
                var $input = $(this).prev();
                var value = $input.val();
                var max = $input.data("max");
                value++;
                if(value > max)value = max;
                $input.val(value);
                tm_total();
            }).on("click",".remove",function(){
                var $input = $(this).next();
                var value = $input.val();
                value--;
                if(value<=0)value=1;
                $input.val(value);
                tm_total();
            });
        });  

        //求总和
        function tm_total(){
            var total = 0;
            $("#listbox").find("li").each(function(){
                var flag = $(this).find(".c_xz").is(":visible");
                if(flag){
                    var money = $(this).find(".money").data("money");
                    var number = $(this).find(".num").val();
                    total += money * number;
                }
            });
            //求用户购买了多少个商品
            var length =$("#listbox").find(".c_xz:visible").length;
            $("#count").text(length);
            $("#sum").text(total);
        };  

    </script>  

 </body>
</html>