// 组合一个搜索字符串     NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];     // 字符串转化为URL     NSURL *url = [NSURL URLWithString:urlStr];      //    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init]; //    [request setURL:url]; //    [request setHTTPMethod:@"POST"]; //    [request setTimeoutInterval:60]; //    [request setHTTPBody:_data]; //    [request setValue:@"ttt" forHTTPHeaderField:@"cookies"];         // url转化为一个请求     NSURLRequest *request = [NSURLRequest requestWithURL:url];     // 状态请求     NSURLResponse *response;     // 链接一个请求     NSData *resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];     // 返回数据转为字符串     NSData *dataString = [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];     NSLog(@"%@", dataString); // 解析json吧

- (void)viewDidLoad {     [super viewDidLoad];     // Do any additional setup after loading the view.          _data = [[NSMutableData alloc] init];          // 组合一个搜索字符串     NSString *urlStr = [NSString stringWithFormat:@"http://www.baidu.com/s?wd=%@", @"php"];     NSURL *url = [NSURL URLWithString:urlStr];          NSURLRequest *request = [NSURLRequest requestWithURL:url];          //发起请求，定义代理     [NSURLConnection connectionWithRequest:request delegate:self];      }   // 分批返回数据 - (void)connection:(NSURLConnection *) connection didReceiveData:(NSData *)data {     [_data appendData:data];     NSLog(@"%@", _data); }   // 数据完全返回完毕 - (void)connectionDidFinishLoading:(NSURLConnection *)connection {     NSString *dataString =  [[NSString alloc] initWithData:_data encoding:NSUTF8StringEncoding];     NSLog(@"%@", dataString); }