/// <summary> /// 元素前贴到另一元素 /// </summary> /// <param name="source"></param> /// <param name="element"></param> /// <returns></returns> public static IHtmlElement InsertBefore(this IHtmlElement source, IHtmlElement element) { if (element == null) { return(source); } if (source == null) { return(source); } element.Before(source); return(source); }