- (void)GCD
{
    /**核心：隊(duì)列＋任務(wù)*/
#pragma mark - 隊(duì)列
    // 全局并發(fā)
    dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    // 主隊(duì)列
    dispatch_get_main_queue();
    // 自創(chuàng)建并發(fā)隊(duì)列
    dispatch_queue_create("CONCURRENT", DISPATCH_QUEUE_CONCURRENT);
    // 自創(chuàng)建串行隊(duì)列
    dispatch_queue_create("SERIAL", DISPATCH_QUEUE_SERIAL);
#pragma mark - 任務(wù)
    // 同步函數(shù)
    dispatch_sync(dispatch_get_global_queue(0, 0), ^{
        
    });
    // 異步函數(shù)
    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        
    });
    
    /*
     同步函數(shù)：必須執(zhí)行完當(dāng)前任務(wù)才能到下一個(gè)
     異步函數(shù)：不需要
     */
    
#pragma mark - 隊(duì)列組
    // 創(chuàng)建隊(duì)列組
    dispatch_group_t group = dispatch_group_create();
    // 任務(wù)
    dispatch_group_async(group, dispatch_get_global_queue(0, 0), ^{
        
    });
    // 任務(wù)執(zhí)行完調(diào)用
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        
    });
}


- (void)NSOperation {
    /**核心：隊(duì)列＋操作*/
#pragma mark - NSBlockOperation
    // 創(chuàng)建NSBlockOperation
    NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
        // 主線程執(zhí)行
    }];
    // 追加操作
    [blockOperation addExecutionBlock:^{
        // 子線程執(zhí)行
    }];
    // 啟動(dòng)操作
    [blockOperation start];
    
#pragma mark - NSOperationQueue
    // 主隊(duì)列
    [NSOperationQueue mainQueue];
    // 非主隊(duì)列
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    // 添加操作到隊(duì)列
    [queue addOperation:blockOperation];
    // 簡(jiǎn)便方法
    [queue addOperationWithBlock:^{
        
    }];
    
    // 設(shè)置操作依賴
    [blockOperation addDependency:[[NSOperation alloc] init]];
}


- (void)NSURLSession {
#pragma mark - GET請(qǐng)求 
    {
        // 1.創(chuàng)建NSURLSession
        NSURLSession *session = [NSURLSession sharedSession];
        // 2.創(chuàng)建task
        // 創(chuàng)建URL
        NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"];
        // 創(chuàng)建請(qǐng)求
        NSURLRequest *request = [NSURLRequest requestWithURL:url];
        // 根據(jù)session創(chuàng)建task
        NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            // 子線程執(zhí)行
        }];
        // 3.執(zhí)行task
        [dataTask resume];
    }
    
#pragma mark - POST請(qǐng)求
    {
        // 1.創(chuàng)建NSURLSession
        NSURLSession *session = [NSURLSession sharedSession];
        // 2.創(chuàng)建task
        // 創(chuàng)建URL
        NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];
        // 創(chuàng)建POST請(qǐng)求
        NSMutableURLRequest *mutableRequest = [NSMutableURLRequest requestWithURL:url];
        mutableRequest.HTTPMethod = @"POST";
        mutableRequest.HTTPBody = [@"username=520it&pwd=520it&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];
        // 根據(jù)session創(chuàng)建task
        NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:mutableRequest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
            // 子線程執(zhí)行
        }];
        // 3.執(zhí)行task
        [dataTask resume];
    }

- (void)NSURLSessionDelegate {
    {
        // 1.創(chuàng)建NSURLSession
        NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
        // 2.創(chuàng)建task
        // 創(chuàng)建URL
        NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"];
        // 創(chuàng)建POST請(qǐng)求
        NSURLRequest *Request = [NSMutableURLRequest requestWithURL:url];
        // 根據(jù)session創(chuàng)建task
        NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:Request];
        // 3.執(zhí)行task
        [dataTask resume];
    }
}

// 1.接收到服務(wù)器響應(yīng)
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler {
    // 通過(guò)completionHandler回調(diào)告訴系統(tǒng)如何處理服務(wù)器返回的數(shù)據(jù)
    completionHandler(NSURLSessionResponseAllow);
}
// 2.接受到服務(wù)器返回的數(shù)據(jù)狡耻，可能多次調(diào)用
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data {
    
}
// 3.完成或失敗時(shí)調(diào)用
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error {
    
}


- (void)AFN {
    {
        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        
        NSDictionary *dict = @{
                               @"username":@"520it",
                               @"pwd":@"520",
                               @"type":@"JSON"
                               };
        
        [manager POST:@"http://120.25.226.186:32812/login" parameters:dict progress:^(NSProgress * _Nonnull uploadProgress) {
            
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            
        }];
    }
    
    
    {
        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        
        manager.responseSerializer = [AFHTTPResponseSerializer serializer];
        manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
        
        [manager GET:@"http://www.baidu.com" parameters:nil progress:^(NSProgress * _Nonnull uploadProgress) {
            
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            
        }];
    }
}
```