h5购物车功能实现里程碑祭奠1024

淩亂°似流年 2022-12-15 12:41 192阅读 0赞

首先，祝各位大佬节日快乐，永无bug！  
前言：言归正传，本文实现购物车的思路是：获取后端的商品列表——前端本地缓存添加的商品数据——从缓存中获取数据渲染到购物车页面——从缓存中获取数据并提交订单。所以主要是购物车数据的存和取以及清除。

## 商品选择页面 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NtZWxsX3Jvb2tpZQ_size_16_color_FFFFFF_t_70_pic_center]  
分析：考虑到商品列表会多处使用，并且增加、减少商品数量的操作都是一样的，所以将右侧的列表做成组件。

/*shopListRight.vue*/
    <template>
      <div class="shopListRight">
        <div class="view-box">
          <i class="ifont i-logo"></i>
          <div class="view-box-item" v-for="(item,index) in listData" :key="index">
            <div class="img">
              <img v-if="item.imgPath" :src="item.imgPath">
              <img v-else src="../assets/images/img_bg.png">
            </div>
            <div class="con-right">
              <div class="con-right-title">{ { item.goodsName}}</div>
              <div class="con-right-bottom">
                <div class="con-right-bottom-price">¥ { { item.price}}</div>
                <div class="con-right-botton-count">
                  <img v-if="item.count" src="../assets/images/goods_reduce.png" @click="delCount(item)">
                  <span v-if="item.count">{ { item.count}}</span>
                  <img src="../assets/images/goods_add.png" @click="addCount(item)">
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </template>

组件的样式

.shopListRight { 
      background: #fff;
    }
    
    .view-box-item { 
      display: flex;
      margin-bottom: 2.03rem;
    }
    .view-box-item:last-of-type { 
      margin-bottom: 0px;
    }
    .view-box-item > .img { 
      width: 3.75rem;
      height: 3.75rem;
      margin-right: 0.9rem;
      background: #f6f6f7;
    }
    .view-box-item > .img > img { 
      width: 100%;
      height: 100%;
    }
    .view-box-item .con-right { 
      flex: 1;
      position: relative;
    }
    .view-box-item .con-right .con-right-title { 
      font-size: 0.87rem;
      font-weight: bold;
      color: #333;
    }
    .view-box-item .con-right .con-right-bottom { 
      position: absolute;
      width: 100%;
      bottom: -0.3rem;
      display: flex;
      justify-content: space-between;
    }
    .view-box-item .con-right .con-right-bottom .con-right-bottom-price { 
      padding-top: 0.3rem;
      font-size: 0.75rem;
      font-weight: bold;
      color: #fe9900;
      vertical-align: middle;
    }
    .view-box-item .con-right .con-right-bottom .con-right-botton-count > span { 
      vertical-align: middle;
      margin: 0 0.503rem;
    }
    .view-box-item .con-right .con-right-bottom .con-right-botton-count > img { 
      width: 1.56rem;
      height: 1.56rem;
      vertical-align: middle;
    }

## 购物车逻辑处理 ##

export default { 
      data() { 
        return { 
          totalMoney: 0,
          totalNum: 0,
          carList: []
        }
      },
      props: { 
        listData: { 
          type: Array,
          default: () => []
        }
      },
      methods: { 
        // 减数量
        delCount(item) { 
          let carList = JSON.parse(localStorage.getItem('carList')) || []
          let index = carList.map(res => res.goodsId).indexOf(item.goodsId)
          if (index > -1 && carList[index].count > 0) { //购物车中已存在点击添加的商品
            carList[index].count--
          }
          let index2 = this.listData.map(item => item.goodsId).indexOf(item.goodsId)
          if (this.listData[index2].count > 0) { 
            this.listData[index2].count--
            if (this.listData[index2].count == 0) { //减到数量为0时从购物车中移除该商品
              let index = carList.map(res => res.goodsId).indexOf(this.listData[index2].goodsId)
              carList.splice(index, 1)
            }
          }
          localStorage.setItem('carList', JSON.stringify(carList))
          this.$emit('initCarList')
          this.priceCount()
          this.numCount()
        },
        // 增加数量
        addCount(obj) { 
          let item = obj
          let index2 = this.listData.map(res => res.goodsId).indexOf(item.goodsId)
          this.listData[index2].count++
          let carList = JSON.parse(localStorage.getItem('carList')) || []
          let index = carList.map(res => res.goodsId).indexOf(item.goodsId)
          if (index > -1) { //购物车中已存在点击添加的商品
            carList[index].count++
          } else { //购物车不存在点击的商品
            item.count = 1
            carList.push(item)
          }
          localStorage.setItem('carList', JSON.stringify(carList))
          this.priceCount()
          this.numCount()
        },
        // 计算总价
        priceCount() { 
          let carList = JSON.parse(localStorage.getItem('carList')) || []
          let totalMoney = 0
          carList.map(res => { 
            totalMoney += (res.price) * (res.count)
          })
          localStorage.setItem('totalMoney', totalMoney)
          this.$emit('getCountMoney', totalMoney)//向外传递数据
        },
        // 计算选购数量
        numCount() { 
          let carList = JSON.parse(localStorage.getItem('carList')) || []
          let totalNum = 0
          carList.map(res => { 
            totalNum += res.count
          })
          localStorage.setItem('totalNum', totalNum)
          this.$emit('getCountNum', totalNum)//向外传递数据
        }
      }
    }

## 在页面使用组件 ##

页面逻辑

data() { 
      return { 
        listData: [],//这是你需要渲染商品列表的数据
      }
    },
    methods:{ 
    	//监听组件的事件、购物车数据变化时会将购物车的数量和对应的总金额传到页面中
    	getCountMoney(value) { 
          this.totalMoney = value.toFixed(2)
        },
        getCountNum(value) { 
          this.totalNum = value
        }
    }

## 购物车页面 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NtZWxsX3Jvb2tpZQ_size_16_color_FFFFFF_t_70_pic_center 1]  
页面代码

<template>
      <div class="carlist">
        <div class="carlist-hand">
          <div class="carlist-hand-total">共计{ { totalNum}}件商品</div>
          <div class="carlist-hand-right" @click="clearAll">
            <img src="../../assets/images/delete_icon.png">
            <span>清空购物车</span>
          </div>
        </div>
        <div class="scroll-div">
          <div class="scroll-div-con" v-if="carList.length">
            <shopListRight :listData="carList" @getCountMoney="getCountMoney" @getCountNum="getCountNum" @initCarList="initCarList"></shopListRight>
          </div>
          <div class="empty-data" v-else>
            <i class="empty-icon iconfont icon-caution"></i>
            <span>暂无数据</span>
          </div>
        </div>
        <div class="bottom-tab">
          <div class="flex-box">
            <div class="bottom-tab-box-price">¥{ { totalMoney}}</div>
            <div class="bottom-tab-right" @click="goTosettlement">
              <div class="car-title">去结算</div>
            </div>
          </div>
        </div>
      </div>
    
    </template>

页面逻辑

最终缓存是这样的存在：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NtZWxsX3Jvb2tpZQ_size_16_color_FFFFFF_t_70_pic_center 2]  
totalNum：记录购物车的选的数量  
carList：记录加入购物车的所有商品信息  
totalMoney：记录购物车中所有商品的价格  
listData：组件渲染的数据

## 看效果 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NtZWxsX3Jvb2tpZQ_size_16_color_FFFFFF_t_70_pic_center 3]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NtZWxsX3Jvb2tpZQ_size_16_color_FFFFFF_t_70_pic_center 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1NtZWxsX3Jvb2tpZQ_size_16_color_FFFFFF_t_70_pic_center 5]  
以上就是h5实现购物车功能的全部了，有问题评论区见！

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