NSURL的常用属性

    NSString *urlstr = @"http://qq.test.com:666/test?index=0&name=haha";
    NSURL *url = [NSURL URLWithString:urlstr];
    NSLog(@"scheme:%@", url.scheme);                    //协议 http
    NSLog(@"host:%@", url.host);                        //域名 qq.test.com
    NSLog(@"port:%@", url.port);                        //端口 666
    NSLog(@"absoluteString:%@", url.absoluteString);    //完整的url字符串:
    NSLog(@"relativePath: %@", url.relativePath);       //相对路径 /test
    NSLog(@"path: %@", url.path);                       //路径 /test
    NSLog(@"pathComponents:%@", url.pathComponents);    //("/",test,"index.php")
    NSLog(@"Query:%@", url.query);                      //参数 index=0&name=haha