今日总结，购物车商品列表背景模糊+渲染成功却报undefined

				<transition name="fold">
			        <div class="shopcart-list" v-show="listShow">
			          <div class="list-header">
			            <div class="title">
			              <span>已选商品</span>
			            </div>
			            <span class="empty" @click="empty" >清空</span>
			          </div>
			          <div class="list-content" ref="listContent">
			            <ul>
			              <li v-for="food in selectFoods" class="food">
			                <span class="name">{{food.goodname}}</span>
			                <div class="price">
			                  <span class="totalPrice"><span class="sign">￥</span>{{(food.price * food.count).toFixed(2)}}</span>
			                </div>
			                <div class="cartcontrol-wrapper">
			                  <!-- 必需传:food="food"，cartcontrol组件才生效  -->
			                  <cartcontrol :food="food"></cartcontrol>
			                </div>
			              </li>
			            </ul>
			          </div>
			        </div>
			    </transition>				<transition name="fold">
			        <div clas