title: How to call vue instance outside it in Javascript
body: <p>How can I call the test vue in javascript? Here is my code, I want to call test when I do something in javascript function.</p>
  
  <pre><code>function clickit() {
     this.test.fetchTestData();    
  }
  
  var test = new Vue({
      el: '#viewport',
      data: {
          test_data: []
      },
  
      mounted: function () {
          this.fetchTestData();
      },
  
      methods: {
          fetchTestData: function () {
              $.get(test.json, function (data) {
                  this.test_data = data;
                 alert(this.test_data.isActive);
              });
          }
      }
  });
  </code></pre>