html部分
<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='UTF-8'>
<meta http-equiv='X-UA-Compatible' content='IE=edge'>
<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="tds.length>0">
<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 tds">
<!-- 这样写不方便制作商品加减 -->
<!-- <td v-for="value in item">{{value}}</td> -->
<td>{{item.id}}</td>
<td>{{item.name}}</td>
<td>{{item.date}}</td>
<!-- <td>{{getFinalPrice(item.price)}}</td> -->
<td>{{item.price | showPrice}}</td>
<td>
<!--: disabled="item.count == 1" 当数量小于等于1的时候按钮禁用 -->
<button @click="decrement(index)" :disabled="item.count == 1">-</button> {{ item.count }}
<button @click="increment(index)">+</button>
</td>
<td><button @click="removeHandle(index)">移除</button></td>
</tr>
</tbody>
<h2>总价格: {{totalPrice|showPrice}}</h2>
</table>
</div>
<h2 v-else>购物车为空</h2>
</div>
<script src='../vue.js'></script>
<script src="main.js"></script>
</body>
</html>
css部分
table {
border: 1px solid #e9e9e9;
border-collapse: collapse;
border-spacing: 0;
}
th,
td {
padding: 8px 16px;
border: 1px solid #e9e9e9;
text-align-last: left;
}
th {
background-color: #f7f7f7;
color: #5c6b77;
font-weight: 600;
}
vue.js部分
const app = new Vue({
el: '#app',
data: {
tds: [{
id: 1,
name: '《算法导论》',
date: '2006-9',
price: 85.00,
count: 1
},
{
id: 2,
name: '《UNIX编程技术》',
date: '2006-2',
price: 39.00,
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: {
// 无过滤器的方法
// getFinalPrice(price) {
// return '¥' + price.toFixed(2)
// },
increment(index) {
this.tds[index].count++
},
decrement(index) {
this.tds[index].count--
},
removeHandle(index) {
this.tds.splice(index, 1)
}
},
// 过滤器
filters: {
showPrice(price) {
return '¥' + price.toFixed(2)
}
},
computed: {
totalPrice() {
// 高阶函数 reduce 此时book拿到的是一个一个的对象
return this.tds.reduce((preValue, book) => { return preValue + book.price * book.count }, 0)
}
}
})

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