【vue】购物车简单demo
代码：
<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
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;
}
</style>
</head>
<body>
<div id="app">
<div v-if='books.length'>
<table>
<thead>
<tr>
<th></th>
<th>书籍</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='(book, index) in books'>
<td>{{book.id}}</td>
<td>{{book.title}}</td>
<td>{{book.publish}}</td>
<td>{{book.price | showPrice}}</td>
<td>
<button @click='decrement(index)' :disabled='book.count <= 1'>-</button>
{{book.count}}
<button @click='increment(index)'>+</button>
</td>
<td><button @click='removeBook(index)'>移除</button></td>
</tr>
</tbody>
</table>
<h3>总价格：{{totalPrice | showPrice}}</h3>
</div>
<h3 v-else>购物车为空</h3>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
const app = new Vue({
el: '#app',
data: {
books: [
{id: 1, title: '算法导论', publish: '2020-01', price: 10, count: 1},
{id: 2, title: '数据结构', publish: '2020-02', price: 20, count: 1},
{id: 3, title: '代码大全', publish: '2020-03', price: 30, count: 1},
{id: 4, title: '删库跑路', publish: '2020-04', price: 40, count: 1}
]
},
methods: {
decrement(index) {
this.books[index].count--
},
increment(index) {
this.books[index].count++
},
removeBook(index) {
this.books.splice(index, 1)
}
},
computed: {
totalPrice() {
// 1.普通for循环
// let totalPrice = 0;
// for (let i = 0; i < this.books.length; i++) {
// totalPrice += this.books[i].price * this.books[i].count
// }
// return totalPrice
// 2.for in
// let totalPrice = 0;
// for (let i in this.books) {
// totalPrice += this.books[i].price * this.books[i].count
// }
// return totalPrice
// 3.for of
// let totalPrice = 0;
// for (let book of this.books) {
// totalPrice += book.price * book.count
// }
// return totalPrice
// reduce
return this.books.reduce((preValue, book) => {
return preValue + book.price * book.count
}, 0)
}
},
filters: {
showPrice(price) {
return '¥' + price.toFixed(2)
}
}
})
</script>
</body>
</html>
效果：
