The very first Vue.js example

HTML

<script src="http://vuejs.org/js/vue.min.js"></script>
<script src="https://code.jquery.com/jquery-3.1.1.js"></script>
<div id="demo">
   <button id="myBtn"  class="sad"> Click Me </button>
</div>

JavaScript

var demo = new Vue({
    el: '#demo',
    data: function(){
    	return {
      };
    },
    methods:{
      myMethod () {
        alert('Do whatever you wanns do')
      }
    },
    mounted () {
				$(".sad").on('click', this.myMethod);
    }
})