CodePen Embed - vue note - v-on + computed + number

<div id="app">
  <div><input type="text" v-model.number="num1"> + <input type="text" v-model.number="num2"> = {{ sum }}</div>
</div>

var vm = new Vue({
  el: "#app",
  data: {
    num1: 0,
    num2: 0
  },
  computed: {
    sum() {
      return this.num1 + this.num2;
    }
  }
});

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