用DOM实现文章采集--通过jquery语法式的方法采集指定对象的文本(6)

                return v.Where((nn, _index) => _index > index); 
            case "first": 
                if (v.Count() > 0) 
                    return new HtmlNode[] { v.First() }; 
                else 
                    return v; 
            case "last": 
                if (v.Count() > 0) 
                    return new HtmlNode[] { v.Last() }; 
                else 
                    return v; 
            case "even": 
                return v.Where((nn, _index) => _index % 2 == 0); 
            case "odd": 
                return v.Where((nn, _index) => (_index & 1) == 1); 
            case "next": 
                return v.Select(nn => nn.NextSibling); 
            case "contains": 
                return v.Where(x => { return x.InnerHtml.Contains(keyword); }); 
            case "empty": 
                return v.Where(x => { return x.HasChildNodes == false; }); 
            case "header": 
                string[] headers = new string[] { "h1", "h2", "h3", "h4", "h5", "h6" };