chat.js

var $messages = $(".messages")

function myFetchFunction() {
  $.getJSON("https://api.parse.com/1/classes/chats?order=-createdAt", function (data) {
    
    // Clear any old output from DOM
    $messages.empty();
    
    // Iterate through response and append each result as a list item
    $.each(data, function (index, result){
      for (var i = 0; i < result.length; i++) {
        $messages.append('<li>' + result[i].text + '</li>');
      };
    });
  });
  
  // Lets refresh in 3 seconds
  setTimeout(myFetchFunction, 3000);
};

// Initial call
myFetchFunction();