效果演示
对于computed的计算属性可以通过这个购物车例子来了解，笔者最近很是疲累，真的不想过多解释了，还请读者自行看代码研究。
参考代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.10/vue.js"></script>
<style>
.container {
width: 80%;
margin: 30px auto;
}
table {
width: 100%;
border: 1px solid blue;
border-collapse: collapse;
}
th {
height: 50px;
}
td{
height: 32px;
}
th, td {
border-bottom: 1px solid blue;
text-align: center;
}
</style>
</head>
<body>
<div id="app">
<div class="container">
<table>
<tr>
<th>序号</th>
<th>商品名称</th>
<th>商品价格</th>
<th>购买数量</th>
<th>操作</th>
</tr>
<tr v-for="iphone in goods">
<td>{{ iphone.id }}</td>
<td>{{ iphone.name }}</td>
<td>{{ iphone.price }}</td>
<td>
<button v-bind:disabled="iphone.count === 0" v-on:click="iphone.count-=1">-</button>
{{ iphone.count }}
<button v-on:click="iphone.count+=1">+</button>
</td>
<td>
<button v-on:click="iphone.count=0">移除</button>
</td>
</tr>
</table>
<p style="text-align:right;"> 总价：${{totalPrice}}</p>
</div>
</div>
<script>
var app = new Vue({
el: '#app',
data: {
goods: [{
id: 1,
name: 'iphone 15 128g',
price: 5999,
count: 1
},
{
id: 2,
name: 'iphone 15 plus 128g',
price: 6999,
count: 1
},
{
id: 3,
name: 'iphone 15 pro 256g',
price: 8999,
count: 1
}]
},
computed: {
totalPrice: function () {
var totalP = 0;
for (var i = 0, len = this.goods.length; i < len; i++) {
totalP += this.goods[i].price * this.goods[i].count;
}
return totalP;
}
}
})
</script>
</body>
</html>
