vue 简单实现购物车案例

这个案例是对前面基础知识的一个整合，用到的知识点还是挺多的，比如 filters 以及属性的动态绑定等。
2020-6-17 修改：求总价格时，换用高阶函数 reduce。
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    thead {
      background-color: rgb(243, 243, 243);
    }

    td,
    th {
      border: solid 1px rgb(226, 226, 226);
    }

    table {
      border-collapse: collapse;
    }

    .end {
      color: black;
      font-size: 30px;
    }
  </style>
</head>

<body>
  <div id="app">
    <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,key) in books">
          <td>{{key+1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.publish}}</td>
          <td>{{item.price | singlePrice}}</td>
          <td>
            <button @click="decrement(key)" :disabled="item.count===1">-</button>
            <button>{{item.count}}</button>
            <button @click="increment(key)">+</button>
          </td>
          <td><button @click="remove(key)">移除</button></td>
        </tr>
      </tbody>
    </table>
    <div class="end">
      <div v-if="books.length!==0">
        总价格{{totalPrice}}
      </div>
      <div v-else> 购物车为空 </div>
    </div>
  </div>
  <script src="vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        books: [{
            name: '《算法导论》',
            publish: '2006-9',
            price: 85,
            count: 1
          },
          {
            name: '《UNIX编程艺术》',
            publish: '2006-2',
            price: 59,
            count: 1
          },
          {
            name: '《编程珠玑》',
            publish: '2008-10',
            price: 39,
            count: 1
          },
          {
            name: '《代码大全》',
            publish: '2006-3',
            price: 128,
            count: 1
          }
        ]
      },
      methods: {
        increment(key) {
          this.books[key].count++;
        },
        decrement(key) {
          this.books[key].count--;
        },
        remove(key) {
          this.books.splice(key, 1);
        }
      },
      computed: {
        totalPrice() {
          //for in 遍历写法
          // let sum = 0;
          // for (let i in this.books) {
          //   sum += this.books[i].price * this.books[i].count;
          // }

          //高阶函数reduce写法
          let sum = this.books.reduce((prev, item) => prev + item.price, 0);

          return '￥' + sum.toFixed(2);

        }
      },
      filters: {
        singlePrice(value) {
          return '￥' + value.toFixed(2);
        }
      }
    })
  </script>
</body>

</html>
vue 简单实现购物车案例

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