CodePen Embed - vue 點擊按鈕使數字累加

<div id="app">
  <div>
    你已經點擊 <button class="btn btn-outline-secondary btn-sm" @click="counter += 1">{{ counter }}</button> 下。
  </div>
</div>

.btn{
  padding: 15px;
  cursor:pointer;
  font-size: 24px;
}


var app = new Vue({
  el: '#app',
  data: {
    counter: 0
  },
});

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