vue-cli2 和vue-cli3
https://www.cnblogs.com/zhanvo/p/10963776.html
<!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>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
<div id="app">
<div>
<input type="button" value="add person" @click="add" />
<div>
<span>平均年龄:{{ average }}</span>
</div>
<div
v-for="item of users"
:key="name"
style="margin-top: 10px; border-bottom: 1px solid"
>
<div><span>姓名</span> <input type="text" v-model="item.name" /></div>
<div><span>年龄</span> <input type="text" v-model="item.age" /></div>
</div>
</div>
</div>
</body>
<script>
var app = new Vue({
el: '#app',
data() {
return {
users: [{ name: 'robin', age: 18 }, { name: 'terry', age: 30 }]
}
},
methods: {
add: function() {
this.users.push({ name: null, age: null })
}
},
computed: {
average() {
return parseInt(
this.users.reduce((total, current) => {
return total + parseInt(current.age ? current.age : 0)
}, 0) / this.users.length
)
}
}
})
</script>
</html>