code: function Node(page, startPosition, endPosition) {
          this.parentNode = null;
          this.page = page;
          this.startPosition = startPosition;
          this.endPosition = endPosition;
          this.nodeName = null;
          this.previousSibling = null;
          this.nextSibling = null;
      }
docs: node structure from htmlparser
  @param page
  @param startPosition
  @param endPosition
  @class KISSY.HtmlParse.Node
   
  node structure from htmlparser
  @param page
  @param startPosition
  @param endPosition
  @class KISSY.HtmlParse.Node