JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://unpkg.com/vue/dist/vue.js"></script>

<div id="app">
  <!--<button v-on:click="clickedButton()">Click here!</button>--> <!--console.log(event): undefined-->
  <button v-on:click="clickedButton()">Click here!</button>
</div>

JavaScript

new Vue({
	el: '#app',
  methods: {
  	clickedButton: function(event) {
      console.log(event);
    	alert("You clicked the button!");
    }
  }
});