14. 带你实现商品下单功能

170 字约 1 分钟读完3131 次阅读更新于 2026/5/3

创建数据库表 orders 和 order_detail

orders

CREATE TABLE `orders` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `order_no` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '订单编号',
  `total` decimal(10,2) DEFAULT NULL COMMENT '总价格',
  `user_id` int DEFAULT NULL COMMENT '下单人ID',
  `status` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '状态',
  `time` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '下单时间',
  `deliver_type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '配送类型',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='订单信息';

order_detail

CREATE TABLE `order_detail` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '主键ID',
  `goods_id` int DEFAULT NULL COMMENT '商品ID',
  `num` int DEFAULT NULL COMMENT '商品数量',
  `order_id` int DEFAULT NULL COMMENT '订单ID',
  `goods_img` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '商品图片',
  `goods_name` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '商品名称',
  `goods_price` decimal(10,2) DEFAULT NULL COMMENT '商品单价',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='订单详情';

开发后端接口

Orders

package com.example.entity;

import java.math.BigDecimal;
import java.util.List;

public class Orders {

    /**主键ID */
    private Integer id;
    /**订单编号 */
    private String orderNo;
    /**总价格 */
    private BigDecimal total;
    /**下单人ID */
    private Integer userId;
    private String userName;
    /**状态 */
    private String status;
    /**下单时间 */
    private String time;
    /**配送类型 */
    private String deliverType;
    private List<Cart> cartList;
    private List<OrderDetail> orderDetailList;

    public List<OrderDetail> getOrderDetailList() {
        return orderDetailList;
    }

    public void setOrderDetailList(List<OrderDetail> orderDetailList) {
        this.orderDetailList = orderDetailList;
    }

    public List<Cart> getCartList() {
        return cartList;
    }

    public void setCartList(List<Cart> cartList) {
        this.cartList = cartList;
    }

    public String getDeliverType() {
        return deliverType;
    }

    public void setDeliverType(String deliverType) {
        this.deliverType = deliverType;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getOrderNo() {
        return orderNo;
    }

    public void setOrderNo(String orderNo) {
        this.orderNo = orderNo;
    }

    public BigDecimal getTotal() {
        return total;
    }

    public void setTotal(BigDecimal total) {
        this.total = total;
    }

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }
}

OrdersMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.mapper.OrdersMapper">

    <select id="selectAll" resultType="com.example.entity.Orders">
        select orders.*, user.name as userName from `orders`
        left join user on orders.user_id = user.id
        <where>
            <if test="orderNo != null"> and orders.order_no like concat('%', #{orderNo}, '%')</if>
            <if test="userId != null"> and orders.user_id = #{userId}</if>
        </where>
        order by orders.id desc
    </select>

    <select id="selectById" resultType="com.example.entity.Orders">
        select * from `orders` where id = #{id}
    </select>

    <delete id="deleteById">
        delete from `orders` where id = #{id}
    </delete>

    <insert id="insert" parameterType="com.example.entity.Orders" useGeneratedKeys="true" keyProperty="id">
        insert into `orders`
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="orderNo != null">order_no,</if>
            <if test="total != null">total,</if>
            <if test="userId != null">user_id,</if>
            <if test="status != null">status,</if>
            <if test="time != null">time,</if>
            <if test="deliverType != null">deliver_type,</if>
        </trim>
        values
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">#{id},</if>
            <if test="orderNo != null">#{orderNo},</if>
            <if test="total != null">#{total},</if>
            <if test="userId != null">#{userId},</if>
            <if test="status != null">#{status},</if>
            <if test="time != null">#{time},</if>
            <if test="deliverType != null">#{deliverType},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.Orders">
        update `orders`
        <set>
            <if test="id != null">
                id = #{id},
            </if>
            <if test="orderNo != null">
                order_no = #{orderNo},
            </if>
            <if test="total != null">
                total = #{total},
            </if>
            <if test="userId != null">
                user_id = #{userId},
            </if>
            <if test="status != null">
                status = #{status},
            </if>
            <if test="time != null">
                time = #{time},
            </if>
            <if test="deliverType != null">
                deliver_type = #{deliverType},
            </if>
        </set>
        where id = #{id}
    </update>

</mapper>

OrderDetail

package com.example.entity;

import java.math.BigDecimal;

public class OrderDetail {

    /**主键ID */
    private Integer id;
    /**商品ID */
    private Integer goodsId;
    /**商品数量 */
    private Integer num;
    /**订单ID */
    private Integer orderId;
    /**商品图片 */
    private String goodsImg;
    /**商品名称 */
    private String goodsName;
    private BigDecimal goodsPrice;

    public BigDecimal getGoodsPrice() {
        return goodsPrice;
    }

    public void setGoodsPrice(BigDecimal goodsPrice) {
        this.goodsPrice = goodsPrice;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(Integer goodsId) {
        this.goodsId = goodsId;
    }

    public Integer getNum() {
        return num;
    }

    public void setNum(Integer num) {
        this.num = num;
    }

    public Integer getOrderId() {
        return orderId;
    }

    public void setOrderId(Integer orderId) {
        this.orderId = orderId;
    }

    public String getGoodsImg() {
        return goodsImg;
    }

    public void setGoodsImg(String goodsImg) {
        this.goodsImg = goodsImg;
    }

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }
}

OrderDetailMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.mapper.OrderDetailMapper">

    <select id="selectAll" resultType="com.example.entity.OrderDetail">
        select * from `order_detail`
        <where>
            <if test="orderId != null">order_id = #{orderId}</if>
        </where>
        order by id desc
    </select>

    <select id="selectById" resultType="com.example.entity.OrderDetail">
        select * from `order_detail` where id = #{id}
    </select>

    <delete id="deleteById">
        delete from `order_detail` where id = #{id}
    </delete>

    <insert id="insert" parameterType="com.example.entity.OrderDetail" useGeneratedKeys="true">
        insert into `order_detail`
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="goodsId != null">goods_id,</if>
            <if test="num != null">num,</if>
            <if test="orderId != null">order_id,</if>
            <if test="goodsImg != null">goods_img,</if>
            <if test="goodsName != null">goods_name,</if>
            <if test="goodsPrice != null">goods_price,</if>
        </trim>
        values
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">#{id},</if>
            <if test="goodsId != null">#{goodsId},</if>
            <if test="num != null">#{num},</if>
            <if test="orderId != null">#{orderId},</if>
            <if test="goodsImg != null">#{goodsImg},</if>
            <if test="goodsName != null">#{goodsName},</if>
            <if test="goodsPrice != null">#{goodsPrice},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.OrderDetail">
        update `order_detail`
        <set>
            <if test="id != null">
                id = #{id},
            </if>
            <if test="goodsId != null">
                goods_id = #{goodsId},
            </if>
            <if test="num != null">
                num = #{num},
            </if>
            <if test="orderId != null">
                order_id = #{orderId},
            </if>
            <if test="goodsImg != null">
                goods_img = #{goodsImg},
            </if>
            <if test="goodsName != null">
                goods_name = #{goodsName},
            </if>
            <if test="goodsPrice != null">
                goods_price = #{goodsPrice},
            </if>
        </set>
        where id = #{id}
    </update>

</mapper>

开发前端页面

Orders.vue

<template>
  <div>
    <div class="card" style="margin-bottom: 5px;">
      <el-input v-model="data.orderNo" style="width: 300px; margin-right: 10px" placeholder="请输入订单编号查询"></el-input>
      <el-button type="primary" @click="load">查询</el-button>
      <el-button type="info" style="margin: 0 10px" @click="reset">重置</el-button>
    </div>

    <div class="card" style="margin-bottom: 5px">
      <el-table :data="data.tableData" stripe :cell-style="{'backgroundColor': '#e8efff'}" default-expand-all>
        <el-table-column type="expand">
          <template #default="props">
            <div style="padding: 10px">
              <el-table :data="props.row.orderDetailList" border>
                <el-table-column label="商品图片" prop="goodsImg" width="100">
                  <template #default="scope">
                    <img :src="scope.row.goodsImg" alt="" style="width: 50px; height: 50px">
                  </template>
                </el-table-column>
                <el-table-column label="商品名称" prop="goodsName" show-overflow-tooltip></el-table-column>
                <el-table-column label="商品单价" prop="goodsPrice" width="100"></el-table-column>
                <el-table-column label="数量" prop="num" width="100">
                  <template #default="scope">
                    X {{ scope.row.num }}
                  </template>
                </el-table-column>
                <el-table-column label="小计" width="150">
                  <template #default="scope">
                    <b style="color: red">{{ (scope.row.goodsPrice * scope.row.num).toFixed(2) }} 元</b>
                  </template>
                </el-table-column>
              </el-table>
            </div>
          </template>
        </el-table-column>
        <el-table-column prop="orderNo" label="订单编号">
          <template #default="scope">
            <b style="color: #333">{{ scope.row.orderNo }}</b>
          </template>
        </el-table-column>
        <el-table-column prop="total" label="总价格">
          <template #default="scope">
            <b style="color: red">{{ scope.row.total }}元</b>
          </template>
        </el-table-column>
        <el-table-column prop="userName" label="下单人"></el-table-column>
        <el-table-column prop="deliverType" label="配送类型"></el-table-column>
        <el-table-column prop="status" label="状态">
          <template #default="scope">
            <el-tag type="danger" v-if="scope.row.status === '已取消'">已取消</el-tag>
            <el-tag type="warning" v-if="scope.row.status === '待接单'">待接单</el-tag>
            <el-tag type="primary" v-if="scope.row.status === '已配送'">>已配送</el-tag>
            <el-tag type="primary" v-if="scope.row.status === '已出货'">>已出货</el-tag>
            <el-tag type="success" v-if="scope.row.status === '已完成'">>已完成</el-tag>
          </template>
        </el-table-column>
        <el-table-column prop="time" label="下单时间"></el-table-column>
        <el-table-column label="订单操作" align="center" width="100">
          <template #default="scope">
            <el-button type="primary" @click="handleEdit(scope.row.id)">出货</el-button>
          </template>
        </el-table-column>
        <el-table-column label="删除" align="center" width="100">
          <template #default="scope">
            <el-button type="danger" @click="handleDelete(scope.row.id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
    </div>

    <div class="card">
      <el-pagination @current-change="load" background layout="total, prev, pager, next" v-model:page-size="data.pageSize" v-model:current-page="data.pageNum" :total="data.total"/>
    </div>

    <el-dialog title="订单信息" width="30%" v-model="data.formVisible" :close-on-click-modal="false" destroy-on-close>
      <el-form ref="formRef" :model="data.form" :rules="data.rules" label-width="80px" style="padding-right: 30px; padding-top: 20px">
        <el-form-item label="名称" prop="name">
          <el-input v-model="data.form.name" autocomplete="off" />
        </el-form-item>
      </el-form>
      <template #footer>
      <span class="dialog-footer">
        <el-button @click="data.formVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">保 存</el-button>
      </span>
      </template>
    </el-dialog>

  </div>
</template>

<script setup>
import request from "@/utils/request";
import {reactive, ref} from "vue";
import {ElMessageBox, ElMessage} from "element-plus";

const formRef = ref()
const data = reactive({
  pageNum: 1,
  pageSize: 3,
  total: 0,
  formVisible: false,
  form: {},
  tableData: [],
  name: null,
  rules: {
    name: [
      { required: true, message: '请输入名称', trigger: 'blur' },
    ]
  }
})

// 分页查询
const load = () => {
  request.get('/orders/selectPage', {
    params: {
      pageNum: data.pageNum,
      pageSize: data.pageSize,
      orderNo: data.orderNo
    }
  }).then(res => {
    data.tableData = res.data?.list
    data.total = res.data?.total
  })
}
load()

// 新增
const handleAdd = () => {
  data.form = {}
  data.formVisible = true
}

// 编辑
const handleEdit = (row) => {
  data.form = JSON.parse(JSON.stringify(row))
  data.formVisible = true
}

// 新增保存
const add = () => {
  request.post('/orders/add', data.form).then(res => {
    if (res.code === '200') {
      load()
      ElMessage.success('操作成功')
      data.formVisible = false
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 编辑保存
const update = () => {
  request.put('/orders/update', data.form).then(res => {
    if (res.code === '200') {
      load()
      ElMessage.success('操作成功')
      data.formVisible = false
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 弹窗保存
const save = () => {
  formRef.value.validate(valid => {
    if (valid) {
      // data.form有id就是更新，没有就是新增
      data.form.id ? update() : add()
    }
  })
}

// 删除
const handleDelete = (id) => {
  ElMessageBox.confirm('删除后数据无法恢复，您确定删除吗?', '删除确认', { type: 'warning' }).then(res => {
    request.delete('/orders/delete/' + id).then(res => {
      if (res.code === '200') {
        load()
        ElMessage.success('操作成功')
      } else {
        ElMessage.error(res.msg)
      }
    })
  }).catch(err => {})
}

// 重置
const reset = () => {
  data.orderNo = null
  load()
}
</script>

<style scoped>
.el-tag {
  font-weight: bold;
}
.el-tag--warning {
  color: orange;
  background-color: #fff2de;
}
</style>

UserOrders.vue

<template>
  <div class="front-container">
    <div style="margin-bottom: 20px;">
      <el-input clearable @clear="load" v-model="data.orderNo" style="width: 400px; height: 40px; margin-right: 10px" placeholder="请输入订单编号查询"></el-input>
      <el-button style="height: 40px" type="primary" @click="load">查 询</el-button>
    </div>

    <div class="card">
      <el-table :data="data.tableData" stripe :cell-style="{'backgroundColor': '#e8efff'}" default-expand-all>
        <el-table-column type="expand">
          <template #default="props">
            <div style="padding: 10px">
              <el-table :data="props.row.orderDetailList" border>
                <el-table-column label="商品图片" prop="goodsImg" width="100">
                  <template #default="scope">
                    <img :src="scope.row.goodsImg" alt="" style="width: 50px; height: 50px">
                  </template>
                </el-table-column>
                <el-table-column label="商品名称" prop="goodsName" show-overflow-tooltip></el-table-column>
                <el-table-column label="商品单价" prop="goodsPrice" width="100"></el-table-column>
                <el-table-column label="数量" prop="num" width="100">
                  <template #default="scope">
                    X {{ scope.row.num }}
                  </template>
                </el-table-column>
                <el-table-column label="小计" width="150">
                  <template #default="scope">
                    <b style="color: red">{{ (scope.row.goodsPrice * scope.row.num).toFixed(2) }} 元</b>
                  </template>
                </el-table-column>
              </el-table>
            </div>
          </template>
        </el-table-column>
        <el-table-column prop="orderNo" label="订单编号" width="240">
          <template #default="scope">
            <b style="color: #333">{{ scope.row.orderNo }}</b>
          </template>
        </el-table-column>
        <el-table-column prop="total" label="总价格">
          <template #default="scope">
            <b style="color: red">{{ scope.row.total }}元</b>
          </template>
        </el-table-column>
        <el-table-column prop="deliverType" label="配送类型"></el-table-column>
        <el-table-column prop="status" label="状态">
          <template #default="scope">
            <el-tag type="danger" v-if="scope.row.status === '已取消'">已取消</el-tag>
            <el-tag type="warning" v-if="scope.row.status === '待接单'">待接单</el-tag>
            <el-tag type="primary" v-if="scope.row.status === '已配送'">>已配送</el-tag>
            <el-tag type="primary" v-if="scope.row.status === '已出货'">>已出货</el-tag>
            <el-tag type="success" v-if="scope.row.status === '已完成'">>已完成</el-tag>
          </template>
        </el-table-column>
        <el-table-column prop="time" label="下单时间"></el-table-column>
        <el-table-column label="订单操作" align="center" width="120">
          <template #default="scope">
            <el-button type="danger" v-if="scope.row.status === '待接单'">取消</el-button>
            <el-button type="primary" v-if="scope.row.status === '待收货'">确认收货</el-button>
          </template>
        </el-table-column>
      </el-table>

      <div style="margin-top: 20px">
        <el-pagination @current-change="load" layout="total, prev, pager, next" v-model:page-size="data.pageSize" v-model:current-page="data.pageNum" :total="data.total"/>
      </div>

    </div>


    <el-dialog title="订单信息" width="30%" v-model="data.formVisible" :close-on-click-modal="false" destroy-on-close>
      <el-form ref="formRef" :model="data.form" :rules="data.rules" label-width="80px" style="padding-right: 30px; padding-top: 20px">
        <el-form-item label="名称" prop="name">
          <el-input v-model="data.form.name" autocomplete="off" />
        </el-form-item>
      </el-form>
      <template #footer>
      <span class="dialog-footer">
        <el-button @click="data.formVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">保 存</el-button>
      </span>
      </template>
    </el-dialog>

  </div>
</template>

<script setup>
import request from "@/utils/request";
import {reactive, ref} from "vue";
import {ElMessageBox, ElMessage} from "element-plus";

const formRef = ref()
const data = reactive({
  user: JSON.parse(localStorage.getItem('system-user') || '{}'),
  pageNum: 1,
  pageSize: 3,
  total: 0,
  formVisible: false,
  form: {},
  tableData: [],
  name: null,
  rules: {
    name: [
      { required: true, message: '请输入名称', trigger: 'blur' },
    ]
  }
})

// 分页查询
const load = () => {
  request.get('/orders/selectPage', {
    params: {
      pageNum: data.pageNum,
      pageSize: data.pageSize,
      orderNo: data.orderNo,
      userId: data.user.id
    }
  }).then(res => {
    data.tableData = res.data?.list
    data.total = res.data?.total
  })
}
load()

// 新增
const handleAdd = () => {
  data.form = {}
  data.formVisible = true
}

// 编辑
const handleEdit = (row) => {
  data.form = JSON.parse(JSON.stringify(row))
  data.formVisible = true
}

// 新增保存
const add = () => {
  request.post('/orders/add', data.form).then(res => {
    if (res.code === '200') {
      load()
      ElMessage.success('操作成功')
      data.formVisible = false
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 编辑保存
const update = () => {
  request.put('/orders/update', data.form).then(res => {
    if (res.code === '200') {
      load()
      ElMessage.success('操作成功')
      data.formVisible = false
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 弹窗保存
const save = () => {
  formRef.value.validate(valid => {
    if (valid) {
      // data.form有id就是更新，没有就是新增
      data.form.id ? update() : add()
    }
  })
}

// 删除
const handleDelete = (id) => {
  ElMessageBox.confirm('删除后数据无法恢复，您确定删除吗?', '删除确认', { type: 'warning' }).then(res => {
    request.delete('/orders/delete/' + id).then(res => {
      if (res.code === '200') {
        load()
        ElMessage.success('操作成功')
      } else {
        ElMessage.error(res.msg)
      }
    })
  }).catch(err => {})
}

// 重置
const reset = () => {
  data.orderNo = null
  load()
}
</script>

<style scoped>
.el-tag {
  font-weight: bold;
}
.el-tag--warning {
  color: orange;
  background-color: #fff2de;
}
</style>

购物车下单（批量下单）

Cart.vue

<template>
  <div class="front-container">
    <div class="card" style="padding: 20px">
      <div>
        <el-table :data="data.tableData" stripe @selection-change="handleSelectionChange">
          <el-table-column type="selection" width="55" />
          <el-table-column label="商品图片">
            <template #default="scope">
              <img style="width: 50px; height: 50px; display: block" :src="scope.row.goodsImg" alt="">
            </template>
          </el-table-column>
          <el-table-column label="商品名称" prop="goodsName"></el-table-column>
          <el-table-column label="商品单价">
            <template #default="scope">
              <b style="color: red">￥{{ scope.row.goodsPrice }}</b>
            </template>
          </el-table-column>
          <el-table-column label="商品数量">
            <template #default="scope">
              <el-input-number @change="changeNum(scope.row)" v-model="scope.row.num" :min="1" style="width: 150px"></el-input-number>
            </template>
          </el-table-column>
          <el-table-column label="操作" align="center" width="100">
            <template #default="scope">
              <el-button type="danger" @click="handleDelete(scope.row.id)">删除</el-button>
            </template>
          </el-table-column>
        </el-table>
      </div>
      <div style="text-align: right; margin-top: 20px; font-size: 20px">总价格：
        <b style="color: red; display: inline-block; min-width: 60px; text-align: left">{{ data.total }} 元</b>
        <div style="margin-top: 10px"><el-button @click="addOrder" type="danger">立即下单</el-button></div>
      </div>
    </div>



    <el-dialog title="下单信息" width="30%" v-model="data.formVisible" :close-on-click-modal="false" destroy-on-close>
      <el-form ref="formRef" :model="data.form" :rules="data.rules" label-width="80px" style="padding-right: 30px; padding-top: 20px">
        <el-form-item label="名称" prop="name">
          <el-input v-model="data.form.name" autocomplete="off" />
        </el-form-item>
      </el-form>
      <template #footer>
      <span class="dialog-footer">
        <el-button @click="data.formVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">保 存</el-button>
      </span>
      </template>
    </el-dialog>

  </div>
</template>

<script setup>
import request from "@/utils/request";
import {reactive, ref} from "vue";
import {ElMessageBox, ElMessage} from "element-plus";

const formRef = ref()
const data = reactive({
  user: JSON.parse(localStorage.getItem('system-user') || '{}'),
  total: 0,
  formVisible: false,
  form: {},
  tableData: [],
  selectedRows: [],
  rules: {
    name: [
      { required: true, message: '请输入名称', trigger: 'blur' },
    ]
  }
})

const addOrder = () => {
  if (!data.selectedRows?.length) {
    ElMessage.warning('请选择商品')
    return
  }
  request.post('/orders/add', { userId: data.user.id, cartList: data.selectedRows }).then(res => {
    if (res.code === '200') {
      ElMessage.success('下单成功')
      load()
    } else {
      ElMessage.error(res.msg)
    }
  })
}

const changeNum = (row) => {
  calTotal()
  data.form = row
  update()
}

const calTotal = () => {
  data.total = 0
  // rows是选中行
  data.selectedRows.forEach(item => {
    data.total += item.goodsPrice * item.num
  })
  if (data.total > 0) {
    data.total = data.total.toFixed(2)
  }
}

const handleSelectionChange = (rows) => {
  data.selectedRows = rows
  calTotal()
}

// 分页查询
const load = () => {
  request.get('/cart/selectAll', {
    params: {
      userId: data.user.id
    }
  }).then(res => {
    data.tableData = res.data
  })
}
load()

// 新增
const handleAdd = () => {
  data.form = {}
  data.formVisible = true
}

// 编辑
const handleEdit = (row) => {
  data.form = JSON.parse(JSON.stringify(row))
  data.formVisible = true
}

// 新增保存
const add = () => {
  request.post('/cart/add', data.form).then(res => {
    if (res.code === '200') {
      load()
      ElMessage.success('操作成功')
      data.formVisible = false
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 编辑保存
const update = () => {
  request.put('/cart/update', data.form).then(res => {
    if (res.code === '200') {
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 弹窗保存
const save = () => {
  formRef.value.validate(valid => {
    if (valid) {
      // data.form有id就是更新，没有就是新增
      data.form.id ? update() : add()
    }
  })
}

// 删除
const handleDelete = (id) => {
  ElMessageBox.confirm('您确定删除吗?', '删除确认', { type: 'warning' }).then(res => {
    request.delete('/cart/delete/' + id).then(res => {
      if (res.code === '200') {
        load()
        ElMessage.success('操作成功')
      } else {
        ElMessage.error(res.msg)
      }
    })
  }).catch(err => {})
}

// 重置
const reset = () => {
  data.name = null
  load()
}
</script>

单个商品下单

GoodDetail.vue

<template>
  <div class="front-container" style="width: 50%">
    <div class="card" style="padding: 20px; display: flex; grid-gap: 20px; margin-bottom: 10px">
      <img :src="data.goods.img" alt="" style="width: 300px; height: 300px">
      <div style="flex: 1">
        <div style="display: flex; align-items: flex-start; grid-gap: 20px; margin-bottom: 10px">
          <div style="font-size: 22px; font-weight: bold; line-height: 25px; flex: 1">
            <el-tag style="margin-right: 5px; float: left; background-color: red; color: white" type="danger" v-if="data.goods.recommend === '是'">推荐</el-tag>
            {{ data.goods.name }}
          </div>
          <div style="width: 60px; cursor: pointer; color: #666" @click="addCollect" v-if="!data.userCollect?.id">
            <el-icon style="position: relative; top: 3px" size="18"><Star /></el-icon>收藏
          </div>
          <div style="width: 100px; cursor: pointer; color: orange" @click="removeCollect" v-if="data.userCollect?.id">
            <el-icon style="position: relative; top: 3px" size="18"><StarFilled /></el-icon>取消收藏
          </div>
        </div>
        <div style="margin-bottom: 20px">
          <span style="color: red; font-size: 18px">￥</span><b style="color: red; font-size: 30px">{{ data.goods.price }}</b>
          <span style="color: #666; margin-left: 20px">累计销量 {{ data.goods.saleCount }}</span>
          <span style="color: #666; margin-left: 20px">剩余库存 {{ data.goods.store }}</span>
        </div>
        <div style="margin-bottom: 20px; padding: 10px; border-radius: 5px; background-color: #e8e4e4; line-height: 25px; text-align: justify">{{ data.goods.description }}</div>
        <div>
          <el-input-number style="width: 150px; height: 40px" :min="1" v-model="data.num"></el-input-number>
          <el-button @click="addCart" style="height: 40px; margin-left: 5px" type="danger">加入购物车</el-button>
          <el-button @click="addOrder" style="height: 40px; margin-left: 5px" type="danger">立即购买</el-button>
        </div>
        <div style="margin-top: 10px; color: #666">校园小卖部销售并发货的商品，由小卖部提供发票和相应的售后服务。请您放心购买！</div>
      </div>
    </div>

    <div class="card" style="padding: 20px; margin-bottom: 50px">
      <div style="font-size: 20px; padding-bottom: 10px; border-bottom: 1px solid #ddd">
        <span @click="changeTab('商品详情')" style="cursor: pointer" :class="{'current-active': data.current === '商品详情' }">商品详情</span>
        <span @click="changeTab('商品评论')" :class="{'current-active': data.current === '商品评论' }" style="cursor: pointer; margin-left: 20px">商品评论</span>
      </div>
      <div v-if="data.current === '商品详情'" style="padding: 10px" v-html="data.goods.content"></div>
      <div v-if="data.current === '商品评论'" style="min-height: 700px">
        <div v-if="data.commentList.length === 0" style="padding: 50px; text-align: center; color: #666">暂无评论...</div>
        <div v-if="data.commentList.length > 0" style="padding: 20px; text-align: center">
<!--          显示评论列表-->
        </div>
      </div>

    </div>
  </div>
</template>

<script setup>
import { reactive } from "vue";
import router from "@/router";
import request from "@/utils/request";
import {ElMessage} from "element-plus";

const data = reactive({
  user: JSON.parse(localStorage.getItem('system-user') || '{}'),
  id: router.currentRoute.value.query.id,
  goods: {},
  num: 1,
  current: '商品详情',
  commentList: [],
  userCollect: {}
})

const addOrder = () => {
  request.post('/orders/add', { userId: data.user.id, cartList: [ {goodsId: data.id, num: data.num } ] }).then(res => {
    if (res.code === '200') {
      ElMessage.success('下单成功')
    } else {
      ElMessage.error(res.msg)
    }
  })
}

const addCart = () => {
  request.post('/cart/add', { goodsId: data.id, num: data.num, userId: data.user.id }).then(res => {
    if (res.code === '200') {
      ElMessage.success('加入购物车成功')
    } else {
      ElMessage.error(res.msg)
    }
  })
}

// 当前的商品是否被当前登录的用户收藏过
const loadCollect = () => {
  request.get('/collect/selectAll', {
    params:{
      goodsId: data.id,
      userId: data.user.id
    }
  }).then(res => {
    if (res.data?.length > 0) {  // 查询到数据了 表示用户收藏过了
      data.userCollect = res.data[0]
    } else {
      data.userCollect = {}
    }
  })
}
loadCollect()

// 取消收藏
const removeCollect = () => {
  request.delete('/collect/delete/' + data.userCollect.id).then(res => {
    if (res.code === '200') {
      ElMessage.success('操作成功')
      loadCollect()
    } else {
      ElMessage.error(res.msg)
    }
  })
}

const addCollect = () => {
  request.post('/collect/add', { goodsId: data.id, userId: data.user.id }).then(res => {
    if (res.code === '200') {
      ElMessage.success('操作成功')
      loadCollect()
    } else {
      ElMessage.error(res.msg)
    }
  })
}

const changeTab = (tabName) => {
  data.current = tabName
}

const load = () => {
  request.get('/goods/selectById/' + data.id).then(res => {
    data.goods = res.data
  })
}
load()
</script>

<style>
.current-active {
  color: red;
  border-bottom: 2px solid red;
  padding-bottom: 10px
}
</style>