Vue implements a simple shopping cart example

This article shares the specific code of Vue to implement a simple shopping cart for your reference. The specific content is as follows

Let’s take a look at the finished effect first.

CSS Part

There is nothing much to say here, just the knowledge point of v-cloak

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;
}
[v-cloak]{
  display: none;
}

HTML Part

Here are some Vue knowledge points used:

v-if
v-for
v-cloak
v-on > @
v-bind > :
methods
computed
filters

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Shopping Cart</title>
  <link rel="stylesheet" href="style.css" >
</head>
<body>
  
  <div id="app" v-cloak>
    <div v-if="books.length">
      <table>
        <thead>
          <tr>
            <th></th>
            <th>Book Title</th>
            <th>Publication Date</th>
            <th>Price</th>
            <th>Purchase quantity</th>
            <th>Delete</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item,index) in books">
            <th>{{item.id}}</th>
            <th>{{item.name}}</th>
            <th>{{item.date}}</th>
            <!--Solution 1 retains decimal points and currency symbols-->
            <!-- <th>{{"￥"+item.price.toFixed(2)}}</th> -->
            <!--Solution 2-->
            <!-- <th>{{getFinalPrice(item.price)}}</th> -->
            <!--Scheme 3-->
            <th>{{item.price | showPrice}}</th>
            <th>
              <button @click="decrement(index)" :disabled="item.count<=0">-</button>
              {{item.count}}
              <button @click="increment(index)">+</button>
            </th>
            <th><button @click="removeHandle(index)">Remove</button></th>
          </tr>
        </tbody>
      </table>
      <h2>Total Price:{{totalPrice | showPrice}}</h2>
    </div>
    <h2 v-else>
      Shopping cart is empty</h2>
  </div>

</body>
<script src="../js/vue.js"></script>
<script src="main.js"></script>
</html>

JS part

const app = new Vue({
  el:"#app",
  data:{
    books:
      {
        id:1,
        name:"Introduction to Algorithms",
        date:'2006-9',
        price:85.00,
        count:1
      },
      {
        id:2,
        name:"The Art of UNIX Programming",
        date:'2006-2',
        price:50.00,
        count:1
      },
      {
        id:3,
        name:"The Art of Programming",
        date:'2008-10',
        price:39.00,
        count:1
      },
      {
        id:4,
        name:"《Code Encyclopedia》",
        date:'2006-3',
        price:128.00,
        count:1
      },
      
    ]
  },
  methods: {
   //Here we give up using the method form to calculate the total price and use the calculated property instead because it is more efficient.
    // 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(){
      // Option 1: Ordinary for loop // let totalPrice = 0;
      // for(let i=0;i<this.books.length;i++){
      // totalPrice += this.books[i].price * this.books[i].count
      // }
      // return totalPrice

      // Solution 2: for in
      // let totalPrice = 0;
      // for(let i in this.books){
      // // console.log(i);//1 2 3 4
      // totalPrice += this.books[i].price * this.books[i].count
      // }
      // return totalPrice

      // Option 3: for of
      // let totalPrice = 0;
      // for(let item of this.books){
      // // console.log(item);//What we get here is each object in the array// totalPrice += item.price * item.count
      // }
      // return totalPrice

      // Solution 4: reduce
      return this.books.reduce(function (preValue, book) {
        // console.log(book); // Output four objects respectively return preValue + book.price * book.count
      }, 0)
    }
  },
  // Filters:{
    showPrice(price){
      return "￥"+price.toFixed(2)
    }
  }
})

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

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