recursion.js

gistfile1.js

var getElementsByClassName = function(className, n) {
  // your code here
  var resultArr = [];
  var searchClass = function(element) {
  	if (element.classList) {
  		if (element.classList.contains(className)) {
  			resultArr.push(element);
  		}
  	}
  	for (var i = 0; i < element.childNodes.length; i++) {
  		searchClass(element.childNodes[i]);
  	}
  }
  searchClass(document.body);
  return resultArr;
};