代码
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div id="app">
<h1>商品数量：{{count}} 个</h1>
<h1>商品单价：{{unitPrice}} 元</h1>
<h1>商品总价：{{totalPrice}} 元</h1>
<button @click="changePrice">修改单价</button>
<button @click="changeCount">修改数量</button>
</div>
</body>
<script src="https://unpkg.com/vue/dist/vue.js"></script>
<script>
var vm = new Vue({
el: '#app',
data: {
count: 10,
unitPrice: 24
},
computed: {
totalPrice() {
return this.count * this.unitPrice
}
},
methods: {
changePrice() {
vm.unitPrice = vm.unitPrice + 1
},
changeCount() {
vm.count = vm.count + 1
}
}
})
</script>
</html>
运行结果