[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        if(data!=nil){
            NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
           
            //重点，重新加载table
            [self.table reloadData];
            
        }
        if(connectionError!=nil){
            NSLog(@"%@",[connectionError description]);
        }
        if(data==nil&&connectionError==nil)
            NSLog(@"null data");
    }];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    
    //重点，重新加载table
    [self.table reloadData];

}];
//发送
[task resume];

NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:config delegate:self delegateQueue:nil];
NSURLSessionTask *task =[session dataTaskWithRequest:request];
self.mutableData = [NSMutableData data];
[task resume];

//代理
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{
    [self.mutableData appendData:data];
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask willCacheResponse:(NSCachedURLResponse *)proposedResponse completionHandler:(void (^)(NSCachedURLResponse * _Nullable))completionHandler{
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:self.mutableData options:0 error:nil];
        
        //重点，重新加载table
        [self.table reloadData];
}