<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>钩子函数</title>
</head>
<body>
    <div id="app">

    </div>

    <script src="../js/vue.js"></script>

    <script>
        let user = {
            name:'',
            city:''
        };

        let vm = new Vue({
            el:'#app',
            data:user,
            mounted:function () {
                user = getUserFromApi();
                //可以使用ajax
            },
            methods:{
                sayHello(){
                    return `欢迎来自${this.city}的${this.name}!`;
                }
            }
        });
    </script>
</body>
</html>