code: function imagePing(url, trackingInfo) {
      var queryString = collection.map(object.keys(trackingInfo), function(key, index) {
          var startWith = index === 0 ? '' : '&';
  
          return startWith + key + '=' + trackingInfo[key];
      }).join('');
      var trackingElement = document.createElement('img');
  
      trackingElement.src = url + '?' + queryString;
  
      trackingElement.style.display = 'none';
      document.body.appendChild(trackingElement);
      document.body.removeChild(trackingElement);
  
      return trackingElement;
  }
docs: Request image ping.
  @param {String} url url for ping request
  @param {Object} trackingInfo infos for make query string
  @returns {HTMLElement}
  @memberof tui.util
  @example
  //-- #1. Get Module --//
  var util = require('tui-code-snippet'); // node, commonjs
  var util = tui.util; // distribution file
  
  //-- #2. Use property --//
  util.imagePing('https://www.google-analytics.com/collect', {
  v: 1,
  t: 'event',
  tid: 'trackingid',
  cid: 'cid',
  dp: 'dp',
  dh: 'dh'
  });