这一篇把之前所学的内容做一个总结，实现一个购物车样例，可以增加或者减少购买数量，可移除商品，并且购物车总价随着你的操作实时变化。
实现效果如图：
代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>购物车案例</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<style>
[v-cloak] {
display: none;
}
table {
border: 1px solid #e9e9e9;
border-collapse: collapse;
border-spacing: 0;
empty-cells: show;
}
th, td {
padding: 8px 16px;
border: 1px solid #e9e9e9;
text-align: left;
}
th {
background-color: #f7f7f7;
color: #5c6b77;
font-weight: 600;
white-space: nowrap;
}
</style>
</head>
<body>
<div id="app" v-cloak>
<table>
<tr>
<th>序列号</th>
<th>商品名称</th>
<th>商品单价</th>
<th>购买数量</th>
<th>操作</th>
</tr>
<tr v-for="(item, index) in list">
<td>{{ index + 1 }}</td>
<td>{{ item.name }}</td>
<td>{{ item.price }}</td>
<td>
<button @click="reduce(index)" :disable="item.count === 1">-</button>
{{ item.count }}
<button @click="add(index)">+</button>
</td>
<td><button @click="del(index)">移除</button></td>
</tr>
</table>
<p>总价：￥{{ total }}</p>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
list: [
{
id: 1,
name: 'Iphone xs',
price: 10000,
count: 1
},
{
id: 2,
name: 'Ipad Pro',
price: 6666,
count: 1
},
{
id: 3,
name: 'MacBook Pro',
price: 25000,
count: 1
},
]
},
methods: {
reduce: function (index) {
if(this.list[index].count === 1) return;
this.list[index].count--;
},
add: function (index) {
this.list[index].count++;
},
del: function (index) {
this.list.splice(index, 1);
}
},
computed: {
total: function () {
var total = 0;
for(var i = 0; i < this.list.length; i++) {
total += this.list[i].price * this.list[i].count;
}
return total.toString().replace(/B(?=(d{3})+$)/g, ',');
}
}
});
</script>
</body>
</html>