Vue完成购物车

<template>
  <div>
    <div class="cart">
      <h2>购物车</h2>
      <table>
        <thead>
          <tr>
            <th></th>
            <th>编号</th>
            <th>商品名称</th>
            <th>价格</th>
            <th>购买数量</th>
            <th>金额</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item, index) in books">
            <td>
              <input type="checkbox" v-model="selectBook" :value="index" />
            </td>
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>
            <td>
              ￥<span>{{ item.price }}</span>
            </td>
            <td>
              <button @click="sub(index, $event)" :disabled="item.count <= 1">
                -
              </button>
              <span>{{ item.count }}</span>
              <button @click="add(index, $event)" :disabled="item.count >= 10">
                +
              </button>
            </td>
            <td class="amount">{{ item.price * item.count }}</td>
            <td><button @click="del(index)">删除</button></td>
          </tr>
        </tbody>
        <tfoot>
          <tr>
            <td colspan="5">总金额：</td>
            <td colspan="2">
              <span class="total">{{ gettotal }}</span>
            </td>
          </tr>
        </tfoot>
      </table>
    </div>
  </div>
</template>

<script>
export default {
  name: "App2",
  data() {
    return {
      books: [
        { id: 1, name: "细说 PHP", price: 158, active: false, count: 1 },
        { id: 2, name: "细说网页制作", price: 158, active: false, count: 2 },
        { id: 3, name: "细说 JavaScript", price: 158, active: false, count: 1 },
        {
          id: 4,
          name: "细说 HTML5 高级 API",
          price: 158,
          active: false,
          count: 1,
        },
        { id: 5, name: "细说 DOM 和 BOM", price: 158, active: false, count: 1 },
      ],
      selectBook: [],
    };
  },
  methods: {
    sub(index, event) {
      if (this.books[index].count > 1) {
        this.books[index].count--;
      }
    },
    add(index, event) {
      if (this.books[index].count < 10) {
        this.books[index].count++;
      }
    },
    del(index) {
      this.books.splice(index, 1);
    },
  },
  computed: {
    gettotal: {
      get() {
        let total = 0;
        this.selectBook.forEach(
          (id) => (total += this.books[id].price * this.books[id].count)
        );
        return total;
      },
    },
  },
};
</script>

<style lang="less">
.cart {
  width: 700px;
  margin: 0 auto;
}
h2 {
  text-align: center;
}
.cart table {
  width: 700px;
  border-collapse: collapse;
}
td,
th {
  border: 1px solid;
}
</style>