黑马程序员前端 Vue3 小兔鲜电商项目——(九)购物车

image-20230625134052235

本地购物车

添加购物车

基础思想:购物车数据存储在 pinia 中,如果已经添加过相同的商品,就在其数量 count 上加一,如果没有添加过,就直接push到购物车列表中。

  1. 在 src\stores\cartStore.js 中封装 cartStore,存储购物车列表:

    import {
          
           ref } from 'vue'
    import {
          
           defineStore } from 'pinia'
    
    export const useCartStore = defineStore('cart', () => {
          
          
        //1.定义state - cartList
        const cartList = ref([])
        //2.定义action - addCart
        const addCart = async (goods) => {
          
          
            // 添加购物车操作
            // 已添加过 - count + 1
            // 没有添加过 - 直接push
            // 思路:通过匹配传递过来的商品对象中的skuId能不能在cartList中找到,找到了就是添加过
            const item = cartList.value.find((item) => goods.skuId === item.skuId)
            if (item) {
          
          
                // 找到了
                item.count++
            } else {
          
          
                // 没找到
                cartList.value.push(goods)
            }
        }
        return {
          
          
            cartList,
            addCart
        }
    
    }, {
          
          
        persist: true
    })
    
  2. 在 src\views\Detail\index.vue 中添加数据组件并绑定相关事件:

    <!-- sku组件 -->
    <XtxSku :goods="goods" @change="skuChange"/>
    
    <!-- 数据组件 -->
    <el-input-number :min="1" v-model="count" @change="countChange" />
    
    <!-- 按钮组件 -->
    <div>
      <el-button size="large" class="btn" @click="addCart">
        加入购物车
      </el-button>
    </div>
    
  3. 编辑事件触发逻辑:

    import {
          
           ElMessage } from 'element-plus'
    import {
          
           useCartStore } from '@/stores/cartStore';
    
    const cartStore = useCartStore()
    
    //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) {
          
          
            //规格已经选择 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 {
          
          
            //规格没有选择 提示用户
            ElMessage.warning('请选择规格')
        }
    }
    

头部购物车

模板代码

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>

渲染数据

  1. 在 src\views\Layout\components\LayoutHeader.vue 中引入购物车组件:

    import HeaderCart from './HeaderCart.vue'
    
  2. 插入组件:

    <!-- 头部购物车 -->
    <HeaderCart/>
    
  3. 在 src\views\Layout\components\HeaderCart.vue 中获取购物车数据:

    import {
          
           useCartStore } from '@/stores/cartStore'
    const cartStore = useCartStore()
    
  4. 渲染数据:

    <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>
    

删除功能实现

  1. src\stores\cartStore.js 中添加删除 action 函数:

    export const useCartStore = defineStore('cart', () => {
          
          
        //1.定义state - cartList
        const cartList = ref([])
        //2.定义action - addCart
        const addCart = async (goods) => {
          
          
          ...
        }
        // 删除购物车
        const delCart = async (skuId) => {
          
          
            // 思路:
            // 1. 找到要删除项的下标值 - splice
            // 2. 使用数组的过滤方法 - filter
            const idx = cartList.value.findIndex((item) => skuId === item.skuId)
            cartList.value.splice(idx, 1)
        }
        return {
          
          
            cartList,
            addCart,
            delCart
        }
    }, {
          
          
        persist: true
    })
    
  2. src\views\Layout\components\HeaderCart.vue 绑定组件触发action函数并传递参数

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

购物车统计信息

  1. src\views\Layout\components\HeaderCart.vue 中使用计算属性统计购物车信息:

    // 计算属性
    // 1. 总的数量 所有项的count之和
    const allCount = computed(() => cartList.value.reduce((a, c) => a + c.count, 0))
    // 2. 总价 所有项的count*price之和
    const allPrice = computed(() => cartList.value.reduce((a, c) => a + c.count * c.price, 0))
    
    return {
          
          
      cartList,
      allCount,
      allPrice,
      addCart,
      delCart
    }
    
  2. 修改 src\views\Layout\components\HeaderCart.vue 代码:

    <div class="total">
      <p>共 {
         
         { cartStore.allCount }} 件商品</p>
      <p>&yen; {
         
         {cartStore.allPrice}} </p>
    </div>
    

列表购物车-基础内容渲染

模版代码

创建 src\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>

路由配置

src\router\index.js 中进行路由配置:

import CartList from '@/views/CartList/index.vue'

{
    
    
  path: 'cartlist',
  component: CartList
}

渲染列表

src\views\CartList\index.vue 中渲染数据:

<script setup>
import { useCartStore } from '@/stores/cartStore'
const cartStore = useCartStore()
</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 cartStore.cartList" :key="i.id">
              <td>
                <!-- 单选框 -->
                <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="cartStore.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>

列表购物车-单选功能实现

核心思路:单选的核心思路就是始终把单选框的状态和Pinia中store对应的状态保持同步。

注意事项:v-modl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。

  1. src\stores\cartStore.js 中添加单选功能:

    // 单选功能
    const singleCheck = (skuId, selected) => {
          
          
      // 通过skuId找到要修改的那一项 然后把它的selected修改为传过来的selected
      const item = cartList.value.find((item) => item.skuId === skuId)
      item.selected = selected
    }
    
  2. src\views\CartList\index.vue 中触发action函数:

    <script setup>
    // 单选回调
    const singleCheck = (i, selected) => {
      console.log(i, selected)
      // store cartList 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)
    }
    </script>
    
    <template>
      <td>
        <!-- 单选框 -->
        <el-checkbox :model-value="i.selected" @change="(selected) => singleCheck(i, selected)" />
      </td>
    </template>
    

列表购物车-全选功能实现

基础思想:

  1. 全选状态决定单选框状态 - 遍历cartList把每一项的selected都设置为何全选框状态一致
  2. 单选框状态决定全选状态 - 只有所有单选框的selected都为true, 全选框才为true
  1. src\stores\cartStore.js 中添加全选功能和计算属性:

    // 全选功能action
    const allCheck = (selected) => {
          
          
      // 把cartList中的每一项的selected都设置为当前的全选框状态
      cartList.value.forEach(item => item.selected = selected)
    }
    
    // 是否全选计算属性
    const isAll = computed(() => cartList.value.every((item) => item.selected))
    
  2. src\views\CartList\index.vue 中触发action函数:

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

列表购物车-统计数据功能实现

在 src\stores\cartStore.js 文件中添加计算属性:

// 3. 已选择数量
const selectedCount = computed(() => cartList.value.filter(item => item.selected).reduce((a, c) => a + c.count, 0))
// 4. 已选择商品价钱合计
const selectedPrice = computed(() => cartList.value.filter(item => item.selected).reduce((a, c) => a + c.count * c.price, 0))

src\views\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 }} </span>
</div>

接口购物车

加入购物车

新建 src\apis\cart.js 文件,接口封装

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 src\stores\cartStore.js 文件的加入购物车方法:

import {
    
     useUserStore } from './user'
import {
    
     insertCartAPI } from '@/apis/cart'

export const useCartStore = defineStore('cart', () => {
    
    
  const userStore = useUserStore()
  const isLogin = computed(() => userStore.userInfo.token)
  //1.定义state - cartList
  const cartList = ref([])
  // 2. 定义action - addCart
  const addCart = async (goods) => {
    
    
    const {
    
     skuId, count } = goods
    if (isLogin.value) {
    
    
      // 登录之后的加入购车逻辑
      await insertCartAPI({
    
     skuId, count })
      const res = await findNewCartListAPI()
      cartList.value = res.result
    } else {
    
    
      // 添加购物车操作
      // 已添加过 - count + 1
      // 没有添加过 - 直接push
      // 思路:通过匹配传递过来的商品对象中的skuId能不能在cartList中找到,找到了就是添加过
      const item = cartList.value.find((item) => goods.skuId === item.skuId)
      if (item) {
    
    
        // 找到了
        item.count++
      } else {
    
    
        // 没找到
        cartList.value.push(goods)
      }
    }
  }
  ...
}

删除购物车

src\apis\cart.js 中封装删除购物车的接口:

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

src\stores\cartStore.js 修改删除购物车的方法:

  // 删除购物车
  const delCart = async (skuId) => {
    
    
    if (isLogin.value) {
    
    
      // 调用接口实现接口购物车中的删除功能
      await delCartAPI([skuId])
      const res = await findNewCartListAPI()
      cartList.value = res.result
    } else {
    
    
      // 思路:
      // 1. 找到要删除项的下标值 - splice
      // 2. 使用数组的过滤方法 - filter
      const idx = cartList.value.findIndex((item) => skuId === item.skuId)
      cartList.value.splice(idx, 1)
    }
  }

退出登录-清空购物车

在用户退出登录时,除了清除用户信息之外,也需要把购物车数据清空。

在购物车store中补充清除购物车的action业务:

//清除购物车
const clearCart = () => {
    
    
  cartList.value = []
}

userStore中找到退出登录 action 执行清除:

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

购物车合并

在用户登录时,把本地的购物车数据和服务端购物车数据进行合并操作。

src\apis\cart.js 中添加登录时调用合并购物车接口:

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

src\stores\user.js 中修改代码:

const getUserInfo = async ({
     
      account, password }) => {
    
    
  const res = await loginAPI({
    
     account, password })
  userInfo.value = res.result
  //合并购物车的操作
  mergeCartAPI(cartStore.cartList.map(item => {
    
    
    return {
    
    
      skuId: item.skuId,
      selected: item.selected,
      count: item.count
    }
  }))
  //获取最新的购物车列表
  cartStore.updateNewList()
}

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转载自blog.csdn.net/qq_20185737/article/details/131375963
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