最新网咯请求

//1.获取网咯路径
    NSString *path = @"http://1.studyios.sinaapp.com/getAllClass.php";
    //2.获取URL
    NSURL *url = [NSURL URLWithString:path];
    //3.创建请求命令
    NSURLRequest *urlr = [NSURLRequest requestWithURL:url];
 NSURLSession *session = [NSURLSession sharedSession];
    //执行绘画的任务 通过request请求获取数据data
    NSURLSessionDataTask *dtatt = [session dataTaskWithRequest:urlr completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
       
        NSArray *arrjson = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
        NSLog(@"%@",arrjson);
    }];
  //真正执行任务

    [dtatt resume];