.<div id="mouse">
  <a
    v-on:mouseover="mouseover"
    v-on:mouseleave="mouseleave">
    {{message}}
  </a>
</div>

body {
  
  background: #333;
  
  #mouse {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: block;
    width: 280px;
    height: 50px;
    margin: 0 auto;
    line-height: 50px;
    text-align: center;
    color: #fff;
    background: #007db9;

    a {
      display: block;
      width: 100%;
      height: 100%;
      cursor: pointer;
    }
  }
}

new Vue({
  el: '#mouse',
  data: {
    message: 'Hover Me!' ,
    timer: null,
    hoverEnterTime: 500,
    hoverLeaveTime: 300
  }, 
  methods: {
    mouseover: function(){
      clearTimeout(this.timer);
      this.timer = setTimeout(() => {
        this.message = 'Good!'
      }, this.hoverEnterTime);
    }, 
    mouseleave: function(){
      clearTimeout(this.timer);
      this.timer = setTimeout(() => {
        this.message = 'Hover Me!!'
      }, this.hoverEnterTime);
    }
  }
})