URL截取问题

下面的代码来自AFNetworing的注释

NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"foo" relativeToURL:baseURL]; 打印：http://example.com/v1/fooNSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"foo?bar=baz" relativeToURL:baseURL];          打印：http://example.com/v1/foo?bar=bazNSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"/foo" relativeToURL:baseURL];                 打印：http://example.com/fooNSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"foo/" relativeToURL:baseURL];                 打印：http://example.com/v1/fooNSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"/foo/" relativeToURL:baseURL];                打印：http://example.com/foo/NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];[NSURL URLWithString:@"http://example2.com/" relativeToURL:baseURL]; 打印// http://example2.com/