十二、Vue 实现 购物车demo

1. html代码

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title></title>
    <link rel="stylesheet" href="style.css">
  </head>
 
  <body>
    <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> {{ getFinalPrice(item.price) }} </td> -->
              <!-- <td> {{ item.price | 过滤器 }} </td> -->
              <td> {{ item.price | showPrice }}
              <td>
                <button @click="increment(index)">+</button>
                {{ item.sumNumber }} 
                <button @click="decrement(index)" v-bind:disabled="item.sumNumber<=1">-</button>
              </td>
              <td> <button @click="removeHandle(index)">移除</button> </td>
            </tr>
          </tbody>
        </table>
        <h2>总价格：{{ totalSumPrice | showPrice }}</h2>
      </div>
      <div v-else>
        <h2>购物车为空</h2>
      </div>
    </div>
    <script src="../jquery/vue.JS"></script>
    <script src="main.js"></script>
  </body>
</html>

2. css代码

table{
  border: 1px solid #e9e9e9;
  border-collapse: collapse;
  border-spacing: 0;
}

th, td{
  padding: 8px 16px;
  border: 1px solid #e9e9e9;
  text-align: center;
}

th{
  background-color: #f7f7f7;
  color: #5c6b77;
  font-weight: 600;
}

3. js代码

const app = new Vue({
  el: "#app",
  data: {
    books: [
      {id: 1, name: "《算法导论》", date: "2006-9", price: 85.00, sumNumber:1},
      {id: 2, name: "《UNIX编程艺术》", date: "2006-2", price: 59.00, sumNumber:1},
      {id: 3, name: "《变成注记》", date: "2008-10", price: 39.00, sumNumber:1},
      {id: 4, name: "《代码大全》", date: "2006-3", price: 128.00, sumNumber:1},
    ],
  },
  methods: {
    // getFinalPrice(price){
    //   return "￥" + price.toFixed(2);
    // },
    increment(index){
      this.books[index].sumNumber++;
    },
    decrement(index){
      this.books[index].sumNumber--;
    },
    removeHandle(index){
      this.books.splice(index,1);
    }
  },
  computed: {
    totalSumPrice(){
      let totalprice = 0;
      // //1. 普通的for循环
      // for(let i=0; i<this.books.length; i++){
      //   totalprice += this.books[i].sumNumber * this.books[i].price;
      // }

      // //2. for(let i in this.books){}
      // for(let i in this.books){
      //   totalprice += this.books[i].sumNumber * this.books[i].price;
      // }

      // //3. for(let i of this.books){}
      // for(let book of this.books){
      //   totalprice += book.sumNumber * book.price;
      // }
      // return totalprice;

      //4. reduce
      return this.books.reduce(function(preValue,book){
        return preValue + book.sumNumber * book.price;
      },0)
    }
  },
  filters: {
    //过滤器、一般为函数
    showPrice(price){
      return "￥" + price.toFixed(2);
    }
  }
});
posted @ 2022-04-07 12:01  搬砖工具人  阅读(77)  评论(0)    收藏  举报