目录

本地加入购物车实现

头部购物车列表渲染

头部购物车删除功能实现

头部购物车统计计算

列表购物车基础数据渲染

列表购物车单选功能

购物车列表全选功能

购物车列表统计数据

接口

加入购物车

删除购物车

优化

退出登录 - 清空购物车数据

合并本地购物车到服务器

---

本地加入购物车实现

创建stores/cartStore.js封装购物车模块

// 封装购物车模块
import { defineStore } from "pinia"
import { ref } from "vue"

export const useCartStore = defineStore('cart', () => {
  const cartList = ref([])
  const addCart = (goods) => {
    // 添加购物车操作
    const item = cartList.value.find((item) => goods.skuId === item.skuId)
    if (item) {
      item.count++
    } else {
      cartList.value.push(goods)
    }
  }
  return {
    cartList, addCart
  }
}, {
  persist: true
})

在views/Detail/index.vue中编辑事件触发逻辑，添加数据组件并绑定相关事件

<script setup>
import DetailHot from './components/DetailHot.vue'
import {getDetail} from '@/apis/detail'
import { ElMessage } from 'element-plus'
import {onMounted,ref} from 'vue'
import {useRoute} from 'vue-router'
import { useCartStore } from '@/stores/cartStore'
const cartStore=useCartStore()
const goods=ref({})
const route=useRoute()
const getGoods=async()=>{
  const res=await getDetail(route.params.id)
  goods.value=res.result
}
onMounted(() => getGoods())

// sku规格被操作时
let skuObj={}
const skuChange=(sku)=>{
    console.log(sku)
    skuObj=sku
}

// count
const count=ref(1)
const countChange=(count)=>{
    console.log(count)
    
}

// 添加购物车
const addCart=()=>{
    if(skuObj.skuId){
        // 触发action
        cartStore.addCart({
            id:goods.value.id,
            name:goods.value.name,
            picture:goods.value.mainPictures[0],
            price:goods.value.price,
            count:count.value,
            skuId:skuObj.skuId,
            attrsText:skuObj.specsText,
            selected:true
        })
    }else{
        // 提示用户
        ElMessage.warning('请选择规格')
    }
}
</script>

<!-- sku组件 -->
<XtxSku :goods="goods" @change="skuChange" />
<!-- 数据组件 -->
<el-input-number v-model="count" @change="countChange" />

头部购物车列表渲染

创建 src\views\Layout\components\HeaderCart.vue 文件，添加以下代码：

<script setup>

</script>

<template>
  <div class="cart">
    <a class="curr" href="javascript:;">
      <i class="iconfont icon-cart"></i><em>2</em>
    </a>
    <div class="layer">
      <div class="list">
        <!--
        <div class="item" v-for="i in cartList" :key="i">
          <RouterLink to="">
            <img :src="i.picture" alt="" />
            <div class="center">
              <p class="name ellipsis-2">
                {{ i.name }}
              </p>
              <p class="attr ellipsis">{{ i.attrsText }}</p>
            </div>
            <div class="right">
              <p class="price">&yen;{{ i.price }}</p>
              <p class="count">x{{ i.count }}</p>
            </div>
          </RouterLink>
          <i class="iconfont icon-close-new" @click="store.delCart(i.skuId)"></i>
        </div>
        -->
      </div>
      <div class="foot">
        <div class="total">
          <p>共 10 件商品</p>
          <p>&yen; 100.00 </p>
        </div>
        <el-button size="large" type="primary" >去购物车结算</el-button>
      </div>
    </div>
</div>
</template>

<style scoped lang="scss">
.cart {
  width: 50px;
  position: relative;
  z-index: 600;

  .curr {
    height: 32px;
    line-height: 32px;
    text-align: center;
    position: relative;
    display: block;

    .icon-cart {
      font-size: 22px;
    }

    em {
      font-style: normal;
      position: absolute;
      right: 0;
      top: 0;
      padding: 1px 6px;
      line-height: 1;
      background: $helpColor;
      color: #fff;
      font-size: 12px;
      border-radius: 10px;
      font-family: Arial;
    }
  }

  &:hover {
    .layer {
      opacity: 1;
      transform: none;
    }
  }

  .layer {
    opacity: 0;
    transition: all 0.4s 0.2s;
    transform: translateY(-200px) scale(1, 0);
    width: 400px;
    height: 400px;
    position: absolute;
    top: 50px;
    right: 0;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    background: #fff;
    border-radius: 4px;
    padding-top: 10px;

    &::before {
      content: "";
      position: absolute;
      right: 14px;
      top: -10px;
      width: 20px;
      height: 20px;
      background: #fff;
      transform: scale(0.6, 1) rotate(45deg);
      box-shadow: -3px -3px 5px rgba(0, 0, 0, 0.1);
    }

    .foot {
      position: absolute;
      left: 0;
      bottom: 0;
      height: 70px;
      width: 100%;
      padding: 10px;
      display: flex;
      justify-content: space-between;
      background: #f8f8f8;
      align-items: center;

      .total {
        padding-left: 10px;
        color: #999;

        p {
          &:last-child {
            font-size: 18px;
            color: $priceColor;
          }
        }
      }
    }
  }

  .list {
    height: 310px;
    overflow: auto;
    padding: 0 10px;

    &::-webkit-scrollbar {
      width: 10px;
      height: 10px;
    }

    &::-webkit-scrollbar-track {
      background: #f8f8f8;
      border-radius: 2px;
    }

    &::-webkit-scrollbar-thumb {
      background: #eee;
      border-radius: 10px;
    }

    &::-webkit-scrollbar-thumb:hover {
      background: #ccc;
    }

    .item {
      border-bottom: 1px solid #f5f5f5;
      padding: 10px 0;
      position: relative;

      i {
        position: absolute;
        bottom: 38px;
        right: 0;
        opacity: 0;
        color: #666;
        transition: all 0.5s;
      }

      &:hover {
        i {
          opacity: 1;
          cursor: pointer;
        }
      }

      a {
        display: flex;
        align-items: center;

        img {
          height: 80px;
          width: 80px;
        }

        .center {
          padding: 0 10px;
          width: 200px;

          .name {
            font-size: 16px;
          }

          .attr {
            color: #999;
            padding-top: 5px;
          }
        }

        .right {
          width: 100px;
          padding-right: 20px;
          text-align: center;

          .price {
            font-size: 16px;
            color: $priceColor;
          }

          .count {
            color: #999;
            margin-top: 5px;
            font-size: 16px;
          }
        }
      }
    }
  }
}
</style>

数据渲染

<script setup>
import { useCartStore } from '@/stores/cartStore'
const cartStore=useCartStore()
</script>

<template>
  <div class="cart">
    <a class="curr" href="javascript:;">
      <i class="iconfont icon-cart"></i><em>{{ cartStore.cartList.length }}</em>
    </a>
    <div class="layer">
      <div class="list">
        
        <div class="item" v-for="i in cartStore.cartList" :key="i">
          <RouterLink to="">
            <img :src="i.picture" alt="" />
            <div class="center">
              <p class="name ellipsis-2">
                {{ i.name }}
              </p>
              <p class="attr ellipsis">{{ i.attrsText }}</p>
            </div>
            <div class="right">
              <p class="price">&yen;{{ i.price }}</p>
              <p class="count">x{{ i.count }}</p>
            </div>
          </RouterLink>
          <i class="iconfont icon-close-new" @click="store.delCart(i.skuId)"></i>
        </div>
       
      </div>
      <div class="foot">
        <div class="total">
          <p>共 10 件商品</p>
          <p>&yen; 100.00 </p>
        </div>
        <el-button size="large" type="primary" >去购物车结算</el-button>
      </div>
    </div>
</div>
</template>

<style scoped lang="scss">
.cart {
  width: 50px;
  position: relative;
  z-index: 600;

  .curr {
    height: 32px;
    line-height: 32px;
    text-align: center;
    position: relative;
    display: block;

    .icon-cart {
      font-size: 22px;
    }

    em {
      font-style: normal;
      position: absolute;
      right: 0;
      top: 0;
      padding: 1px 6px;
      line-height: 1;
      background: $helpColor;
      color: #fff;
      font-size: 12px;
      border-radius: 10px;
      font-family: Arial;
    }
  }

  &:hover {
    .layer {
      opacity: 1;
      transform: none;
    }
  }

  .layer {
    opacity: 0;
    transition: all 0.4s 0.2s;
    transform: translateY(-200px) scale(1, 0);
    width: 400px;
    height: 400px;
    position: absolute;
    top: 50px;
    right: 0;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    background: #fff;
    border-radius: 4px;
    padding-top: 10px;

    &::before {
      content: "";
      position: absolute;
      right: 14px;
      top: -10px;
      width: 20px;
      height: 20px;
      background: #fff;
      transform: scale(0.6, 1) rotate(45deg);
      box-shadow: -3px -3px 5px rgba(0, 0, 0, 0.1);
    }

    .foot {
      position: absolute;
      left: 0;
      bottom: 0;
      height: 70px;
      width: 100%;
      padding: 10px;
      display: flex;
      justify-content: space-between;
      background: #f8f8f8;
      align-items: center;

      .total {
        padding-left: 10px;
        color: #999;

        p {
          &:last-child {
            font-size: 18px;
            color: $priceColor;
          }
        }
      }
    }
  }

  .list {
    height: 310px;
    overflow: auto;
    padding: 0 10px;

    &::-webkit-scrollbar {
      width: 10px;
      height: 10px;
    }

    &::-webkit-scrollbar-track {
      background: #f8f8f8;
      border-radius: 2px;
    }

    &::-webkit-scrollbar-thumb {
      background: #eee;
      border-radius: 10px;
    }

    &::-webkit-scrollbar-thumb:hover {
      background: #ccc;
    }

    .item {
      border-bottom: 1px solid #f5f5f5;
      padding: 10px 0;
      position: relative;

      i {
        position: absolute;
        bottom: 38px;
        right: 0;
        opacity: 0;
        color: #666;
        transition: all 0.5s;
      }

      &:hover {
        i {
          opacity: 1;
          cursor: pointer;
        }
      }

      a {
        display: flex;
        align-items: center;

        img {
          height: 80px;
          width: 80px;
        }

        .center {
          padding: 0 10px;
          width: 200px;

          .name {
            font-size: 16px;
          }

          .attr {
            color: #999;
            padding-top: 5px;
          }
        }

        .right {
          width: 100px;
          padding-right: 20px;
          text-align: center;

          .price {
            font-size: 16px;
            color: $priceColor;
          }

          .count {
            color: #999;
            margin-top: 5px;
            font-size: 16px;
          }
        }
      }
    }
  }
}
</style>

头部购物车删除功能实现

在stores/cartStore.js中补充删除购物车功能

  const delCart = (skuId) => {
    // splice
    const idx = cartList.value.findIndex((item) => skuId === item.skuId)
    cartList.value.splice(idx, 1)
  }
  return {
    cartList, addCart, delCart
  }

在HeaderCart.vue中修改代码，调用delCart删除对应的购物车

<i class="iconfont icon-close-new" @click="cartStore.delCart(i.skuId)"></i>

头部购物车统计计算

在stores/cartStore.js中补充计算商品总数量和总价格的计算属性

const allCount = computed(() => cartList.value.reduce((a, c) => a + c.count, 0))
const allPrice = computed(() => cartList.value.reduce((a, c) => a + c.count * c.price, 0))

在HeaderCart.vue中修改代码，渲染商品总数量和总价格

      <div class="foot">
        <div class="total">
          <p>共 {{ cartStore.allCount }} 件商品</p>
          <p>&yen; {{ cartStore.allPrice.toFixed(2) }} </p>
        </div>
        <el-button size="large" type="primary" >去购物车结算</el-button>
      </div>
    </div>

列表购物车基础数据渲染

创建views/CartList/index.vue文件

<script setup>

</script>

<template>
  <div class="xtx-cart-page">
    <div class="container m-top-20">
      <div class="cart">
        <table>
          <thead>
            <tr>
              <th width="120">
                <el-checkbox/>
              </th>
              <th width="400">商品信息</th>
              <th width="220">单价</th>
              <th width="180">数量</th>
              <th width="180">小计</th>
              <th width="140">操作</th>
            </tr>
          </thead>
          <!-- 商品列表 -->
          <tbody>
            <tr v-for="i in cartList" :key="i.id">
              <td>
                <el-checkbox />
              </td>
              <td>
                <div class="goods">
                  <RouterLink to="/"><img :src="i.picture" alt="" /></RouterLink>
                  <div>
                    <p class="name ellipsis">
                      {{ i.name }}
                    </p>
                  </div>
                </div>
              </td>
              <td class="tc">
                <p>&yen;{{ i.price }}</p>
              </td>
              <td class="tc">
                <el-input-number v-model="i.count" />
              </td>
              <td class="tc">
                <p class="f16 red">&yen;{{ (i.price * i.count).toFixed(2) }}</p>
              </td>
              <td class="tc">
                <p>
                  <el-popconfirm title="确认删除吗?" confirm-button-text="确认" cancel-button-text="取消" @confirm="delCart(i)">
                    <template #reference>
                      <a href="javascript:;">删除</a>
                    </template>
                  </el-popconfirm>
                </p>
              </td>
            </tr>
            <tr v-if="cartList.length === 0">
              <td colspan="6">
                <div class="cart-none">
                  <el-empty description="购物车列表为空">
                    <el-button type="primary">随便逛逛</el-button>
                  </el-empty>
                </div>
              </td>
            </tr>
          </tbody>

        </table>
      </div>
      <!-- 操作栏 -->
      <div class="action">
        <div class="batch">
          共 10 件商品，已选择 2 件，商品合计：
          <span class="red">¥ 200.00 </span>
        </div>
        <div class="total">
          <el-button size="large" type="primary" >下单结算</el-button>
        </div>
      </div>
    </div>
  </div>
</template>

<style scoped lang="scss">
.xtx-cart-page {
  margin-top: 20px;

  .cart {
    background: #fff;
    color: #666;

    table {
      border-spacing: 0;
      border-collapse: collapse;
      line-height: 24px;

      th,
      td {
        padding: 10px;
        border-bottom: 1px solid #f5f5f5;

        &:first-child {
          text-align: left;
          padding-left: 30px;
          color: #999;
        }
      }

      th {
        font-size: 16px;
        font-weight: normal;
        line-height: 50px;
      }
    }
  }

  .cart-none {
    text-align: center;
    padding: 120px 0;
    background: #fff;

    p {
      color: #999;
      padding: 20px 0;
    }
  }

  .tc {
    text-align: center;

    a {
      color: $xtxColor;
    }

    .xtx-numbox {
      margin: 0 auto;
      width: 120px;
    }
  }

  .red {
    color: $priceColor;
  }

  .green {
    color: $xtxColor;
  }

  .f16 {
    font-size: 16px;
  }

  .goods {
    display: flex;
    align-items: center;

    img {
      width: 100px;
      height: 100px;
    }

    >div {
      width: 280px;
      font-size: 16px;
      padding-left: 10px;

      .attr {
        font-size: 14px;
        color: #999;
      }
    }
  }

  .action {
    display: flex;
    background: #fff;
    margin-top: 20px;
    height: 80px;
    align-items: center;
    font-size: 16px;
    justify-content: space-between;
    padding: 0 30px;

    .xtx-checkbox {
      color: #999;
    }

    .batch {
      a {
        margin-left: 20px;
      }
    }

    .red {
      font-size: 18px;
      margin-right: 20px;
      font-weight: bold;
    }
  }

  .tit {
    color: #666;
    font-size: 16px;
    font-weight: normal;
    line-height: 50px;
  }

}
</style>

在HeaderCart.vue文件中补充路由跳转代码

<el-button size="large" type="primary" @click="$router.push('/cartlist')">去购物车结算</el-button>

在router/index.js中进行路由配置

import CartList from '@/views/CartList/index.vue'
{
    path: 'cartlist',
    component: CartList
}

列表购物车单选功能

        思路：始终把单选框的状态和Pinia中store对应的状态保持同步

        注意：v-model双向绑定指令不方便进行命令式的操作（因为后续还需要调用接口)，所以把 v-model 回退到一般模式，也就是：:model-value和@change的配合实现。

在CartList/index.vue中绑定点击事件

// 单选回调
const singleCheck=(i,selected)=>{
  /*
    store中cartList是一个数组，无法知道要修改谁的选中状态
    除了selected补充一个用来筛选的参数 - skuId
  */ 
 cartStore.singleCheck(i.skuId,selected)
}

<!-- 单选框 -->
<el-checkbox :model-value="i.selected" @change="(selected)=>singleCheck(i,selected)"/>

在stores/cartStore.js中寻找需要修改的单选按钮

  // 单选功能
  const singleCheck = (skuId, selected) => {
    // 找到需要修改的项
    const item = cartList.value.find((item) => item.skuId === skuId)
    item.selected = selected
  }

购物车列表全选功能

思路：操作单选决定全选；操作全选决定单选

在CartList/index.vue中绑定点击事件

<script setup>
// 全选回调
const allCheck=(selected)=>{
  cartStore.allCheck(selected)
}
</script>
<template>
<!-- 全选框 -->
    <el-checkbox :model-value="cartStore.isAll" @change="allCheck"/>
</template>

在stores/cartStore.js中修改单选按钮

// 全选
  const isAll = computed(() => cartList.value.every((item) => item.selected))

购物车列表统计数据

在CartList/index.vue中渲染数据

        <div class="batch">
          共 {{ cartStore.allCount }} 件商品，已选择 {{ cartStore.selectedCount }} 件，商品合计：
          <span class="red">¥ {{ cartStore.selectedPrice.toFixed(2) }} </span>
        </div>

在stores/cartStore.js中添加计算属性

  // 已选择数量
  const selectedCount = computed(() => cartList.value.filter(item => item.selected).reduce((a, c) => a + c.count, 0))
  const selectedPrice = computed(() => cartList.value.filter(item => item.selected).reduce((a, c) => a + c.count * c.price, 0))

接口

加入购物车

新建 src\apis\cart.js 文件，接口封装

// 封装购物车相关接口

import http from '@/utils/http'

// 加入购物车
export const insertCartAPI = ({ skuId, count }) => {
  return http({
    url: '/member/cart',
    method: 'POST',
    data: {
      skuId,
      count
    }
  })
}

//获取最新的购物车列表
export const findNewCartListAPI = () => {
  return http({
    url: '/member/cart'
  })
}

修改加入购物车逻辑，先判断是否有用户登录

import { insertCartAPI, findNewCartListAPI } from '@/apis/cart'
  const useStore = useUserStore()
  const isLogin = computed(() => useStore.userInfo.token)
  const addCart = async (goods) => {
    const { skuId, count } = goods
    if (isLogin) {
      // 登录之后的加入购物车逻辑
      await insertCartAPI({ skuId, count })
      const res = await findNewCartListAPI()
      cartList.value = res.result
    } else {
      // 添加购物车操作
      const item = cartList.value.find((item) => goods.skuId === item.skuId)
      if (item) {
        item.count++
      } else {
        cartList.value.push(goods)
      }
    }

  }

删除购物车

在apis/cart.js中封装接口

// 删除购物车
export const delCartAPI = (ids) => {
  return http({
    url: '/member/cart',
    method: 'DELETE',
    data: {
      ids
    }
  })
}

import { insertCartAPI, findNewCartListAPI, delCartAPI } from '@/apis/cart'
  const delCart = async (skuId) => {
    if (isLogin.value) {
      // 调用接口删除购物车
      await delCartAPI([skuId])
      const res = await findNewCartListAPI()
      cartList.value = res.result
    } else {
      // splice
      const idx = cartList.value.findIndex((item) => skuId === item.skuId)
      cartList.value.splice(idx, 1)
    }

  }

优化

添加购物车和删除购物车时使用了两次更新购物车：

  // 获取最新购物车列表
  const updateNewList = async () => {
    const res = await findNewCartListAPI()
    cartList.value = res.result
  }
  const addCart = async (goods) => {
    const { skuId, count } = goods
    if (isLogin) {
      // 登录之后的加入购物车逻辑
      await insertCartAPI({ skuId, count })
      updateNewList()
    } else {
      // 添加购物车操作
      const item = cartList.value.find((item) => goods.skuId === item.skuId)
      if (item) {
        item.count++
      } else {
        cartList.value.push(goods)
      }
    }

  }
  const delCart = async (skuId) => {
    if (isLogin.value) {
      // 调用接口删除购物车
      await delCartAPI([skuId])
      updateNewList()
    } else {
      // splice
      const idx = cartList.value.findIndex((item) => skuId === item.skuId)
      cartList.value.splice(idx, 1)
    }

  }

统一命名格式：

退出登录 - 清空购物车数据

        当用户退出登录时，除了清除用户信息之外，还要清除购物车信息

在cartStore.js中编写清除购物车action

  // 清除购物车
  const clearCart = () => {
    cartList.value = []
  }
  return {
    cartList, allCount, allPrice, isAll, selectedCount, selectedPrice, clearCart, addCart, delCart, singleCheck, allCheck
  }

在userStore.js中当用户退出时，调用清除购物车的action

import { useCartStore } from "./cartStore"
  const cartStore = useCartStore()
  // 退出时清除用户信息
  const clearUserInfo = () => {
    userInfo.value = {}
    // 执行清除购物车的action
    cartStore.clearCart()
  }

合并本地购物车到服务器

        由于用户在非登录时进行的所有购物车操作，我们的服务器不能知道，因此，在用户登陆时，把本地的购物车数据和服务端购物车数据进行合并操作

1. 登录时调用合并购物车接口，在apis/cart,js中封装接口

// 合并购物车
export const mergeCartAPI = (data) => {
  return http({
    url: '/member/cart/merge',
    method: 'POST',
    data
  })
}

在userStore.js中合并购物车操作

import { mergeCartAPI } from "@/apis/cart"
    // 合并购物车操作
    mergeCartAPI(cartStore.cartList.map(item => {
      return {
        skuId: item.skuId,
        selected: item.selected,
        count: item.count
      }
    }))

2. 获取最新的购物车列表

    cartStore.updateCartList()