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new Vue({
  el: '#app',
  data: {
    title: 'Hello World!'
  },
  methods: {
      changeTitle: function(evnet) {
          this.title = event.target.value;
      }
  }
});

<script src="https://unpkg.com/vue/dist/vue.js"></script>
<div id='app'>
    <input type="text" v-on:input="changeTitle">
	<p>{{ title }}</p>
</div>