<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>图书购物车</title>
<script src="vue/vue.js"></script>
<style>
table {
border: 1px solid #e9e9e9;
border-collapse: collapse;
border-spacing: 0;
}
th, td {
padding: 0px 16px;
border: 1px solid #e9e9e9;
text-align: left;
}
th {
background-color: #f7f7f7;
color: #5c6b77;
font-weight: 600;
}
</style>
</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="(b, index) in books">
<td>{{b.id}}</td>
<td>{{b.name}}</td>
<td>{{b.date}}</td>
<td>{{b.price | showPrice}}</td>
<td>
<button :disabled="b.count <= 0" @click="decrement(index)">-</button>
{{b.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>
const app = new Vue({
el: "#app",
data: {
books: [
{
id: 1,
name: "《算法导论》",
date: "2006-9",
price: 85.00,
count: 0
},
{
id: 2,
name: "《UNIX编程艺术》",
date: "2006-2",
price: 59.00,
count: 0
},
{
id: 3,
name: "《编程珠玑》",
date: "2008-10",
price: 39.00,
count: 0
},
{
id: 4,
name: "《算法导论》",
date: "2006-9",
price: 85.00,
count: 0
},
]
},
methods: {
increment(index) {
this.books[index].count += 1;
},
decrement(index) {
this.books[index].count -= 1;
},
removeHandle(index) {
this.books.splice(index, 1);
}
},
computed: {
totalPrice() {
/* let totalPrice = 0;
for (let i = 0; i<this.books.length; i++) {
totalPrice += this.books[i].price * this.books[i].count;
}
return totalPrice*/
// 使用高阶函数reduce
return this.books.reduce((prev, book) => prev + book.price * books.count,0)
}
},
filters: {
showPrice(price) {
return "￥" + price.toFixed(2);
}
}
})
</script>
</body>
</html>