URLComponents.init(url:resolvingAgainstBaseURL:)的文档说:ReturnstheinitializedURLcomponentsobject,orniliftheURLcouldnotbeparsed.知道:SwiftURL/NSURL适用于基于RFC1808、RFC1738和RFC2732的URL:https://developer.apple.com/documentation/foundation/nsurlSwiftURLComponents/NSURLComponents适用于基于RFC3986的URL:https://devel