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getAjax = function(url){
  var ajax = new XMLHttpRequest();
  ajax.onreadystatechange = function() {
    if (ajax.readyState === 4) {
      if (ajax.status === 200 || ajax.status === 304) {
        document.body.innerHTML = ajax.responseText;  
      }
    }
  };
  ajax.open("GET",url,true);
  ajax.send();
}
getAjax('https://dl.dropboxusercontent.com/u/23834858/api/data.html');