代码如下：
index.html
//index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>书籍购物车</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='(each,index) in books'>
<!-- <td v-for='value in each'>{
{
value}}</td> -->
<td>{
{
each.id}}</td>
<td>{
{
each.name}}</td>
<td>{
{
each.date}}</td>
<!-- 打印格式 法1.用函数 -->
<!-- <td>{
{
getFinalPrice(each.price)}}</td> -->
<!-- 打印格式 法2.用过滤器 -->
<td>{
{
each.price | showPrice}}</td>
<td>
<button @click = 'decrement(index)' :disabled = "each.count == 1">-</button>
{
{
each.count}}
<button @click = 'increment(index)'>+</button>
</td>
<td><button @click = 'removeHandle(index)'>移除</button></td>
</tr>
</tbody>
</table>
<h2>总价格：{
{
totalPrice}}</h2>
</div>
<h2 v-else>购物车为空！</h2>
</div>
<script src="../JS/vue.js"></script>
<script src="main.js"></script>
</body>
</html>
CSS
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;
}
JS
const app = new Vue({
el: '#app',
data: {
books: [
{
id: 1,
name: '《算法导论》',
date: '2009-9',
price: 85.00,
count: 1
},
{
id: 2,
name: '《UNIX编程艺术》',
date: '2006-7',
price: 59.00,
count: 1
},
{
id: 3,
name: '《编程珠玑》',
date: '2002-1',
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);
}
},
// 过滤器
filters: {
showPrice(price) {
return '￥' + price.toFixed(2)
}
},
computed: {
totalPrice() {
let result = 0;
// 法1：传统方法
// for (let i = 0; i < this.books.length; i++) {
// result = result + this.books[i].price * this.books[i].count;
// }
// 法2：for index in books
// for(let index in this.books){
// result += this.books[index].price * this.books[index].count;
// }
// 法3：for each of books
// for(each of this.books){
// result += each.price *each.count
// }
// 法4： 直接用高阶函数 reduce
return this.books.reduce(function(pre,book){
return pre + book.price * book.count;
},0)
return result
}
}
})
实现情况如下：
