NSURL *url = [NSURL URLWithString:@"http://reg.email.163.com/unireg/call.do?cmd=register.entrance&from=163navi&regPage=163"];

    NSLog(@"Scheme: %@", [url scheme]);

    NSLog(@"Host: %@", [url host]);

    NSLog(@"Port: %@", [url port]);

    NSLog(@"Path: %@", [url path]);

    NSLog(@"Relative path: %@", [url relativePath]);

    NSLog(@"Path components as array: %@", [url pathComponents]);

    NSLog(@"Parameter string: %@", [url parameterString]);

    NSLog(@"Query: %@", [url query]);

    NSLog(@"Fragment: %@", [url fragment]);

    NSLog(@"User: %@", [url user]);

    NSLog(@"Password: %@", [url password]);

-- ::27.929 NSURLtestDemo[:] Scheme: http

-- ::27.929 NSURLtestDemo[:] Host: reg.email..com

-- ::27.929 NSURLtestDemo[:] Port: (null)

-- ::27.929 NSURLtestDemo[:] Path: /unireg/call.do

-- ::27.929 NSURLtestDemo[:] Relative path: /unireg/call.do

-- ::27.930 NSURLtestDemo[:] Path components as array: (

    "/",

    unireg,

    "call.do"

)

-- ::27.930 NSURLtestDemo[:] Parameter string: (null)

-- ::27.930 NSURLtestDemo[:] Query: cmd=register.entrance&from=163navi&regPage=

-- ::27.930 NSURLtestDemo[:] Fragment: (null)

-- ::27.930 NSURLtestDemo[:] User: (null)

-- ::27.930 NSURLtestDemo[:] Password: (null)