最终效果展示：支持搜索，支持物品数量添加，支持删除等操作，总价会随着数量和删除的操作发生变化，最适合新手练习Vue3用了

实现的案例代码：

<template>
  <div>
    <h2>1024小神的购物车</h2>
    <div><input v-model="search" type="text" /><button>搜索</button></div>
    <div>
      <table border width="600" cellspacing="0" style="margin-top: 10px">
        <thead>
          <th>物品名称</th>
          <th>物品单价</th>
          <th>物品数量</th>
          <th>物品总价</th>
          <th>操作</th>
        </thead>
        <tbody>
          <tr v-for="(good, index) in searchData" :key="index">
            <td align="center">{{ good.name }}</td>
            <td align="center">{{ good.price }}</td>
            <td align="center">
              <button @click="good.num > 1 ? good.num-- : 1">-</button>
              {{ good.num }}
              <button @click="good.num++">+</button>
            </td>
            <td align="center">{{ good.total }}</td>
            <td align="center"><button @click="deleteGood(index)">删除</button></td>
          </tr>
          <tr>
            <td colspan="5" align="right">总价：{{ total }}</td>
          </tr>
        </tbody>
      </table>
    </div>
  </div>
</template>

<script setup lang="ts">
import { ref, reactive, computed } from 'vue'

// 搜索商品
const search = ref('')

const searchData = computed(() => {
  return goodData.filter((item) => {
    return item.name.includes(search.value)
  })
})

// 删除商品
const deleteGood = (index:number)=>{
  goodData.splice(index, 1)
}

// 定义商品
type good = {
  name: string
  price: number
  num: number
  total: number
}
// 商品数据列表
const goodData = reactive<good[]>([
  {
    name: '苹果手机',
    price: 1500,
    num: 1,
    total: 1500
  },
  {
    name: '安卓手机',
    price: 500,
    num: 1,
    total: 500
  },
  {
    name: '游戏机',
    price: 100,
    num: 1,
    total: 100
  },
  {
    name: '大屏电视',
    price: 1000,
    num: 1,
    total: 1000
  }
])

// 定义计算属性计算总价
const total = computed(() => {
  return goodData.reduce((pre, cur) => {
    return pre + cur.price * cur.num
  }, 0)
})
</script>

<style scoped></style>