<div  class="container" id="app">

    <div class="wrapper">

        <h1 class="caption">It's event time! Click on button!</h1>

        <button class="button" v-on:click="onClick">Press me</button>

    </div>

</div>

new Vue({
    el: "#app",
    method: {
        onClick: function () {
            alert('Hi, it's me!')
        }
    }
});