UrlSerializer
Serializes and deserializes a URL string into a URL tree.
      
      abstract class UrlSerializer {
  abstract parse(url: string): UrlTree
  abstract serialize(tree: UrlTree): string
}
    说明
The url serialization strategy is customizable. You can make all URLs case insensitive by providing a custom UrlSerializer.
See DefaultUrlSerializer for an example of a URL serializer.
方法
Parse a url into a   | 
Converts a   |