gistfile1.txt

  exports.loadJSON = function(file, callback) {
    var req = new XMLHttpRequest();  
    req.overrideMimeType('application/json');  
    req.open('GET', 'data/'+file);  
    req.onreadystatechange = function () {
      if(req.readyState === 4) {
        if(req.status === 200 || req.status == 0) {
          if (typeof callback !== 'undefined') callback();
          console.log(req.responseText);
          return JSON.parse(req.responseText);
        }
      }
    }
    req.send(null);
  }