vue 实现购物车

<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="toggleShow">
          <div class="logo-wrapper">
            <div class="logo" :class="{highlight: totalCount}">
              <i class="iconfont icon-shopping_cart" :class="{highlight: totalCount}"></i>
            </div>
            <div class="num" v-if="totalCount">{{totalCount}}</div>
          </div>
          <div class="price" :class="{highlight: totalCount}">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{info.deliveryPrice}}元</div>
        </div>
        <div class="content-right">
          <div class="pay" :class="payClass">
            {{payText}}
          </div>
        </div>
      </div>
      <!-- 购物车列表 -->
      <transition name="move">
        <div class="shopcart-list" v-show="listShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="clearCart">清空</span>
          </div>
          <div class="list-content">
            <ul>
              <li class="food" v-for="(food, index) in cartFoods" :key="index">
                <span class="name">{{food.name}}</span>
                <div class="price"><span>￥{{food.price}}</span></div>
                <div class="cartcontrol-wrapper">
                  <CartControl :food="food"/>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
    </div>
    <!-- 蒙层 -->
    <transition name="fade">
        <div class="list-mask" v-show="listShow" @click="toggleShow"></div>
    </transition>
  </div>
</template>

<script>
  import { MessageBox } from 'mint-ui'
  import BScroll from 'better-scroll'
  import {mapState, mapGetters} from 'vuex'
  import CartControl from '../CartControl/CartControl.vue'

  export default {
    data () {
      return {
        isShow: false
      }
    },

    computed: {
      ...mapState(['cartFoods', 'info']),
      ...mapGetters(['totalCount', 'totalPrice']),
      payClass () {
        const {totalPrice} = this
        const {minPrice} = this.info

        return totalPrice>=minPrice ? 'enough' : 'not-enough'
      },
      payText () {
        const {totalPrice} = this
        const {minPrice} = this.info
        if(totalPrice===0) {
          return `￥${minPrice}元起送`
        } else if(totalPrice<minPrice) {
          return `还差￥${minPrice-totalPrice}元起送`
        } else {
          return '结算'
        }
      },

      listShow () {
        // 如果总数量为0, 直接不显示
        if(this.totalCount===0) {
          this.isShow = false
          return false
        }

        if(this.isShow) {
          this.$nextTick(() => {
            // 实现BScroll的实例是一个单例
            if(!this.scroll) {
              this.scroll = new BScroll('.list-content', {
                click: true
              })
            } else {
              this.scroll.refresh() // 让滚动条刷新一下: 重新统计内容的高度
            }

          })
        }

        return this.isShow
      }
    },


    methods: {
      toggleShow () {
        // 只有当总数量大于0时切换
        if(this.totalCount>0) {
          this.isShow = !this.isShow
        }
      },

      clearCart () {
        MessageBox.confirm('确定清空购物车吗?').then(action => {
          this.$store.dispatch('clearCart')
        }, () => {});
      }
    },
    components: {
      CartControl
    }
  }
</script>

<style lang="less" rel="stylesheet/less" scoped>
  @import "../../common/lesses/mixins.less";
  //只写了购物车列表和蒙层的动画样式
  .shopcartlist {
      position: absolute;
      left: 0;
      top: 0;
      z-index: -1;
      width: 100%;
      transition: translateY(-100%);
      &.move-enter-active, &.move-leave-active {
          transition: transform 0.5s;
      }
      &.move-enter, &.move-leave-to {
          transform: translateY(0)
      }
      .list-header {
          height: 40px;
          line-height: 40px;
          padding: 0 18px;
          background:  #f3f5f7;
          border-bottom: 1px solid rgba(7, 17, 27, 0.1);
          .title {
              float: left;
              font-size: 14px;
              color: rgb(7, 17, 27);
          }
          empty {
              float: right;
              font-size: 12px;
              color: rgb(0, 160, 220);
          }
      }
      .list-content {
          padding: 0 18px;
          max-height: 217px;
          overflow: hidden;
          background: #fff;
          .food {
              position: rlative;
              padding: 12px 0;
              box-sizing: border-box;
              .bottom-border-1px(rgba(7, 17, 27, 0.1));
              .name {
                  line-height: 24px;
                  font-size: 14px;
                  color: rgb(7, 17, 27);
              }
              .price {
                  position: absolute;
                  right: 90px;
                  bottom: 12px;
                  line-height: 24px;
                  font-size: 14px;
                  font-weight: 700;
                  color: rgb(240, 20, 20);
              }
              .cartcontrol-wrapper {
                  position: absolute;
                  right: 0;
                  bottom: 6px;
              }
          }
      }
  }
  .list-mask {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 40;
      backdrop-filter: blur(10px);
      opacity: 1;
      background: rgba(7, 17, 27, 0.6);
      &.fade-enter-active, &.fade-leave-active {
          transition: all 0.5s;
      }
      &.fade-enter, &.fade-leave-to {
          opacity: 0;
          background: rgba(7, 17, 27, 0.1);
      }
  }
</style>