anchor.diff:  
     <body>
       testuser id: <span id="testuser">null</span><br>
  -    users: <span id="users"><%= User.count %></span><br>
  -    follows: <span id="follows"><%= Follow.count %></span><br>
  -    tweets: <span id="tweets"><%= Tweet.count %></span><br>
  -
  +    users: <span id="users">0</span><br>
  +    follows: <span id="follows">0</span><br>
  +    tweets: <span id="tweets">0</span><br>
   
       <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
       <script>
  -    var timer = 0;
   
       function testuser() {
         $.ajax({
  
positive.code:       })
      }
  
      timer = setInterval(function() {
        testuser();
        userNumber();
        followNumber();
        tweetNumber();
      }, 7000);
      </script>
    </body>
  </html>
  
negative.code:         success: function( data ) {
            if (data) {
              $("#testuser").text(data.id);
            }
          }
        })
  