Hello World

HTML

<script src="https://vuejs.org/js/vue.min.js"></script>
<div id="demo">
  <button  @mouseup="mouseU">
    mouseDown </button>
</div>

JavaScript

var data = {
  message: 'Hello Vue.js!'
}

var demo = new Vue({
  el: '#demo',
  data: function() {
    return {
      age: ''
    };
  },
  methods: {
    mouseDown() {
      alert("mouseDown")
    },
    mouseU() { alert('yolo')}
  }
})