Vue学习13_Vue实现简易的图书购物车
Vue实现简单的图书商城利用vue实现简单的图书商城系统,包括点击对应的书本数量,数量增加,点击减少按钮,数量减少,加个也随着书本数量的变化而变化,当点击移除按钮时,书本从购物车中移除,当所有书本都被移除时,显示购物车为空信息提示:HTML代码:<!DOCTYPE html><html lang="en"><head><meta charset="UTF-
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Vue实现简易的图书购物车
利用vue实现简单的图书商城系统,包括点击对应的书本数量,数量增加,点击减少按钮,数量减少,加个也随着书本数量的变化而变化,当点击移除按钮时,书本从购物车中移除,当所有书本都被移除时,显示购物车为空信息提示:
HTML代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>购物车案例</title>
<link rel="stylesheet" href="./style.css">
<script src="../js/vue.js"></script>
</head>
<body>
<div id="app">
<div v-if="books.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="(book,index) in books">
<td>{{book.id}}</td>
<td>{{book.name}}</td>
<td>{{book.date}}</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="remove(index)">移除</button>
</td>
</tr>
</tbody>
</table>
<h2>总价格{{totalPrice3 | showPrice}}</h2>
</div>
<h2 v-else>
购物车为空
</h2>
</div>
<script src="./main.js"></script>
</body>
</html>
CSS代码:
table{
border: 1px soild #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-size: 600;
}
JS代码:
const app = new Vue({
el: '#app',
data: {
books: [{
id: 1,
name: '《算法导论》',
date: '2019-06',
price: 85.00,
count: 1
},
{
id: 2,
name: '《计算机组成原理》',
date: '2019-09',
price: 59.00,
count: 1
},
{
id: 3,
name: '《数据结构》',
date: '2018-12',
price: 39.00,
count: 1
},
{
id: 4,
name: '《计算机网络》',
date: '2020-07',
price: 128.00,
count: 1
}
]
},
computed: {
// 普通的for循环
totalPrice() {
let total = 0;
for (let i = 0; i < this.books.length; i++) {
total += this.books[i].price * this.books[i].count;
}
return total;
},
// for in循环
totalPrice1() {
let total = 0;
for (let i in this.books) {
total += this.books[i].price * this.books[i].count;
}
return total;
},
// of方法遍历
totalPrice2() {
let total = 0;
for (let book of this.books) {
total += book.price * book.count;
}
return total
},
// 高阶函数使用
totalPrice3() {
return this.books.reduce(function (preValue, book) {
return preValue + book.price * book.count;
}, 0)
}
},
methods: {
decrement(index) {
if (this.books[index].count > 1) {
this.books[index].count--
}
},
increment(index) {
this.books[index].count++
},
remove(index) {
this.books.splice(index, 1)
}
},
// 过滤器
filters: {
showPrice(price) {
return '¥' + price.toFixed(2)
}
}
})
**运行结果:**初始界面:
更改书籍数量,总价格也随之改变:
点击移除按钮,书籍信息被移除:
当所有书籍信息都被移除后:界面显示购物车为空
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