Find the element with the nth word under a particular element.js

Search.prototype._findNthWord = function(node, n, current_count) {
  if(current_count === undefined)
    current_count = { i: 0 };

  var children = node.childNodes;
  for(var i = 0; i < children.length; i++) {
    var child = children[i];
    switch(child.nodeType) {
    case 1:
      var result = this._findNthTextNode(child, n, current_count);
      if(result)
        return result;
      break;
    case 3:
      var text = child.wholeText.strip().replace(/\s+/g, ' ');
      if(text.length > 0) {
        var words = text.split(' ');
        if(current_count.i + words.length > n) {
          return { node: node, startsAt: current_count };
        } else {
          current_count.i += words.length;
        }
      }
    }
  }
  return null;
};