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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
  
  <div id="app">
    <input type="text" v-model="price" @keyup="trackChange">
  </div>
  
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>
  
</body>
</html>
 
const app = new Vue({
  
  el: '#app',
  
  data: {
    price: 0
  },
  
  methods: {
    trackChange() {
      this.price = parseInt(this.price) === 0  ? null : this.price
    }
  },
  
  created() {
    this.trackChange()
  }
  
  
})
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anonymouspro
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