anchor.diff:      <div class="row">
           <div class="col-md-6">
               <a class="btn btn-info" href="${ctx}/product/">继续购买</a>
  -            <button class="btn btn-warning" id="cleanCart">清空购物车</button>
  +            <button class="btn btn-info" id="cleanCart">清空购物车</button>
           </div>
           <div class="col-md-6 text-right">
               <a class="btn btn-primary" href="${ctx}/order/purchase/">结账</a>
  
positive.code:                             <td>${ci.product.model}</td>
                              <td>${ci.product.code}</td>
                              <td>${ci.product.point}</td>
                              <td>${ci.total}</td>
                              <td><a class="btn btn-info delBtn" productid="${ci.product.id}">删除</a></td>
                          </tr>
                      </c:forEach>
                      </tbody>
  
negative.code: <%@include file="/common/header-nav.jsp" %>
  <div class="container">
      <div class="row">
          <table class="table table-responsive table-striped">
              <c:choose>
                  <c:when test="${empty sessionScope.cart}">
                      <tbody class="text-center">
  