<div id="app">
    <div v-if="books.length">
      <table>
        <thead>
          <tr>
            <th></th>
            <th>书籍名称</th>
            <th>出版日期</th>
            <th>价格</th>
            <th>购买数量</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item, index) in books">
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>
            <td>{{item.date}}</td>
 
            <td>
              <!-- 价格 保留两位小数 拼接 ¥ -->
              <!-- 法1  总价格那里也需要这个 所以这样写不太好 -->
              <!-- {{item.price.toFixed(2)}} -->
 
              <!-- 法2 调用方法 -->
              <!-- {{getFinalPrice(item.price)}} -->
 
              <!-- 法3 过滤器 -->
              {{item.price | showPrice}}
 
            </td>
            <td>
              <!-- v-bind动态绑定属性如果为true就表示有这个属性 v-bind:disabled="true" 渲染出来就是disabled 所以这里只需要一个布尔值就行 -->
              <button @click="decrement(index)" v-bind:disabled="item.count <= 1">-</button>
              {{item.count}}
              <button @click="increment(index)">+</button>
            </td>
            <td><button @click="removeHandle(index)">移除</button></td>
          </tr>
        </tbody>
      </table>
      <h2>总价格: {{totalPrice | showPrice}}</h2>
    </div>
    <h2 v-else>购物车为空</h2>
 
  </div>
 
table {
  border: 1px solid #e9e9e9;
  border-collapse: collapse;
  border-spacing: 0;
}
 
th, td {
  padding: 8px 16px;
  border: 1px solid #e9e9e9;
  text-align: left;
}
 
th {
  background-color: #f7f7f7;
  color: #5c6b77;
  font-weight: 600;
}
const app = new Vue({
  el: '#app',
  data: {
    books: [
      {
        id: 1,
        name: '《算法导论》',
        date: '2006-9',
        price: 85.00,
        count: 1
      },
      {
        id: 2,
        name: '《UNIX编程艺术》',
        date: '2006-2',
        price: 59.00,
        count: 1
      },
      {
        id: 3,
        name: '《编程珠玑》',
        date: '2008-10',
        price: 39.00,
        count: 1
      },
      {
        id: 4,
        name: '《代码大全》',
        date: '2006-3',
        price: 128.00,
        count: 1
      },
    ]
  },
  methods: {
    // getFinalPrice(price) {
    //   return '¥' + price.toFixed(2)
    // }
 
    increment(index) {
      this.books[index].count++
    },
    decrement(index) {
      this.books[index].count--
    },
    removeHandle(index) {
      this.books.splice(index, 1)
    }
  },
  computed: {
    totalPrice() {
      let totalPrice = 0
      for (let i = 0; i < this.books.length; i++) {
        totalPrice += this.books[i].price * this.books[i].count
      }
      return totalPrice
 
      // 其他计算总价格方法
      // for (let i in/of this.books)
      // reduce
    }
  },
  filters: { // 过滤器
    showPrice(price) { // 参数是你要过滤的东西
      // toFixed 保留两位小数
      return '¥' + price.toFixed(2)
    }
  }
})

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/vue/2.7.8/vue.min.js