<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="app">
<div v-if="books.length">
<table border="" cellspacing="" cellpadding="">
<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 books">
<td>{{item.id}}</td>
<td>{{item.name}}</td>
<td>{{item.data}}</td>
<td>{{item.price | showPrice}}</td> <!--过滤器 -->
<td>
<button @click="decrement(index)" v-bind:disabled="item.count <= 1">-</button>
{{item.count}}
<button @click="increment(index)">+</button>
</td>
<td>
<button @click="remove(index)">删除</button>
</td>
</tr>
</tbody>
</table>
<h2>
总价格:{{totolPrice | showPrice}}
</h2>
</div>
<h2 v-else>购物车为空</h2>
</div>
</body>
<script type="text/javascript" src="../vue.js"></script>
<script src="index.js"></script>
</html>
table{
border: 1px solid #ccc;
border-collapse: collapse;
border-spacing: 0;
}
th,td{
padding: 8px 16px;
border: 1px solid #ccc;
text-align: left;
}
th{
background-color: #e7e7e7;
color: darkgray;
font-weight: 600;
}
const app = new Vue({
el:'#app',
data:{
books:[
{id:100,name:'计算机组成原理',data:2002,price:100,count:1},
{id:101,name:'现代操作系统',data:2002,price:100,count:1},
{id:102,name:'Unix编程艺术',data:2002,price:100,count:1},
{id:103,name:'代码大全',data:2002,price:100,count:1},
],
},
methods:{
increment(index){
this.books[index].count++;
},
decrement(index){
this.books[index].count--;
},
remove(index){
this.books.splice(index,1)
}
},
//计算属性
computed:{
totolPrice(){
//第一种写法
let totolPrice = 0;
for(let i=0;i<this.books.length;i++){
totolPrice += this.books[i].count * this.books[i].price;
}
return totolPrice;
//第二种写法
// let totolPrice = 0;
// for(let i in this.books){
// totolPrice += this.books[i].count * this.books[i].price;
// }
// return totolPrice;
//第三种写法
// let totolPrice = 0;
// for(item of this.books){
// totolPrice += item.count * item.price;
// }
// return totolPrice;
}
},
//过滤器
filters:{
showPrice(price){
return '￥' + price.toFixed(2);
}
}
})
