absoluteString

?后是第一个参数
&后是后面的参数

NSURL *url = [NSURL URLWithString:@“http://www.baidu.com/search?id=1”];

NSLog(@“scheme:%@”, [url scheme]); //协议 http

NSLog(@“host:%@”, [url host]); //域名 www.baidu.com

NSLog(@“absoluteString:%@”, [url absoluteString]); //完整的url字符串

NSLog(@“relativePath: %@”, [url relativePath]); //相对路径 search

NSLog(@“port :%@”, [url port]); // 端口 8080

NSLog(@“path: %@”, [url path]); // 路径 search

NSLog(@“pathComponents:%@”, [url pathComponents]); // search

NSLog(@“Query:%@”, [url query]); //参数 id=1