Vue

HTML

<div id="app">
  <h2>Example:</h2>
  <label>
    <input type="text" v-on:keydown.esc="upCounter" />
  </label>
  <div>
  <span>Event count: {{ counter }}</span>
  </div>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

Vue

new Vue({
  el: "#app",
  data: {
    counter: 0
  },
  methods: {
  	upCounter: function(){
    	this.counter++
    }
  }
})