<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <input type="text" @keyup="handlerKeyUp">
        <br>
        <input type="text" @keyup="handlerKeyUp($event)">
    </div>

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

    <script>
        let vm = new Vue({
            el:'#app',
            methods:{
                handlerKeyUp(event){
                    console.log(event.key,event);
                }
            }
        });
    </script>
</body>
</html>