<!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>
<style>
    .active {
        color: red;
    }
</style>

<body>
    <div id="app">
        <h2>总价格:{{fullname}}</h2>
    </div>
    <script src="./js/vue.js"></script>
    <script>
        var app = new Vue({
            el: '#app',
            data: {
                firstname: 'geyao',
                lastname: 'hello'
            },
            methods: {

            },
            computed: {
                name: 'codewhy',
                fullname: {
                    set: function(newValue) {
                        console.log('------------', newValue)
                        const names = newValue.split(' ');
                        this.firstname = names[0];
                        this.lastname = names[1];
                    },
                    get: function() {
                        return this.firstname + ' ' + this.lastname
                    }
                }
            }
        })
    </script>
</body>

</html>

运行结果