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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>
  
</head>
<body>
​
  <div id="app">
    <h1>Total: {{sum}}</h1>
    <button-counter @add-sum="sum++"></button-counter>
    <button-counter @add-sum="sum++"></button-counter>
  </div>
  
</body>
</html>
 
button{
  font-size: 20px;
  margin: 10px;
}
 
Vue.component('button-counter', {
  data: function () {
    return {
      count: 0
    }
  },
  template: '<button @click="count++; $emit(\'add-sum\')">You clicked me {{ count }} times.</button>',
})
​
​
var app = new Vue({
  el: '#app',
  data: {
    sum: 0
  }
});
Output

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