title: Laravel and axios clear Form after submit
body: <p>In my Laravel app i'm submitting a form with vue and axios.
  After the submit i want to clear the input field in the form, but it wont work.</p>
  
  <p><strong>HTML:</strong></p>
  
  <pre><code>&lt;form method="post" enctype="multipart/form-data" v-on:submit.prevent="addPost"&gt;
    &lt;textarea id="post_area" v-model="content"&gt;&lt;/textarea&gt;
    .....
  &lt;/form&gt;
  </code></pre>
  
  <p><strong>JS:</strong></p>
  
  <pre><code>const app = new Vue({
  el: '#app',
  data: {
    content: '',
    posts: []
  },
  
  ......
  
  .then(function (response) {
     if(response.status===200) {
        //reload posts
        app.posts = response.data;
        this.content = '';
     }
  })
  </code></pre>
  
  <p>It just wont clear out the input field.</p>