POST

    //创建网址字符串对象

    NSString *urlStr = [NSString stringWithFormat:@"http://api.tudou.com/v3/gw"];

    //创建URL对象

    NSURL *url = [NSURL URLWithString:urlStr];

    //创建请求对象

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

        //创建参数字符串

    NSString *parmStr = [NSString stringWithFormat:@"method=album.channel.get&appKey=myKey&format=json&channel=t&pageNo=1&pageSize=10"];

        //设置请求体 (提交的内容)

    NSData *data = [parmStr dataUsingEncoding:NSUTF8StringEncoding];

    [request setHTTPBody:data];

        //设置请求方式

    [request setHTTPMethod:@"POST"];

    

    //创建连接

    //同步

    NSData *data1 = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

    [self analysisData:data1];

//异步 (推荐)

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

        //解析

        [self analysisData:data];

    }];