code: function updateClassesWrite(treeNodes) {
  	var node, j;
  	for (var i = 0; i < treeNodes.length; i++) {
  		node = treeNodes[i];
  		for (j = 0; j < node._changes.length; j++) {
  			(node._changes[j][0] ? addQuery : removeQuery)(node._element, node._changes[j][1]);
  		}
  		node._changes = [];
  		updateClassesWrite(node._children);
  	}
  }
docs: Update classes write step
  
  @param  {Array.<{_element: Element, _children: array, _queries: array, _changes: array, _done: boolean}>} treeNodes