How to implement multiple counter in VueJS

I'm a beginner and I'm working on a little exercice right now where I need to implement a function that will vote for a specific picture every time we click on the "Vote" button.

Here is what it looks like, for example if I click on the first button, I need to increment the number of vote for this picture. Here is what i did :

<div id="display" class="container">
    <table class="w3-table-all" id="tableDisplay">
      <tr>
        <th>Cat</th>
        <th>Vote</th>
      </tr>
    </table>
    <div v-for="display in gridData">
    <table class="w3-striped w3-table-all table table-bordered" id="tableDisplay">
      <tr class="w3-hover-light-grey">
        <th>
          <img :src="display.url" height="200px" width="300px"/>
        </th>
        <th>
          <button class="w3-button w3-green w3-hover-light-green"v-on:click="test(display.counter,display.id)" v-bind:id="display.id">Vote !</button>
        </th>
      </tr>
    </table>

  </div>

</div>

And the vueJs part :

new Vue({


el :'#display',
  data: {
    gridData :[
    {
        "url": "http://24.media.tumblr.com/tumblr_m82woaL5AD1rro1o5o1_1280.jpg",
        "id": "MTgwODA3MA",
        "counter" : 0
    },
    {
        "url": "http://24.media.tumblr.com/tumblr_m29a9d62C81r2rj8po1_500.jpg",
        "id": "tt",
        "counter" : 0

    }
  ],
},
  methods:{
    test: function(count,id){
      count ++;
      alert(count);
    }
  },
})

And the problem is that it doesn't update the change, in the "counter" section it still at 0.

Thank you for any help.