SOURCE

   new Vue({
      el: "#app",
      data: {
        isHide: 'test'
      },
      methods: {
        ok () {
          alert("欢迎您购买本产品");
        },
        cancel () {
          this.isHide = !this.isHide;
        }
      }
    })

<div id="app">
<div>
  {{isHide}}
</div>
</div>

#app{
    background: white;
}