原来

NSOperationQueue *queue=[[NSOperationQueue alloc] init];

    MyTask *myTask=[[MyTask alloc] init];

    [queue addOperation:myTask];

    [myTask release];

    

    MyTask *myTask1=[[MyTask alloc] init];

    [queue addOperation:myTask1];

    

    MyTask *myTask2 = [[MyTask alloc] init];

    [queue addOperation:myTask2];

//-------------------------------------------------------------------------------------

2015-03-19 16:35:03.849 TimerTest[6209:1409385] 开始线程=<MyTask: 0x1742346a0>{name = '(null)'}

2015-03-19 16:35:03.850 TimerTest[6209:1409384] 开始线程=<MyTask: 0x174234820>{name = '(null)'}

2015-03-19 16:35:03.849 TimerTest[6209:1409386] 开始线程=<MyTask: 0x174234900>{name = '(null)'}

2015-03-19 16:35:03.852 TimerTest[6209:1409384] 执行了NSTimer

2015-03-19 16:35:03.853 TimerTest[6209:1409386] 执行了NSTimer

2015-03-19 16:35:03.853 TimerTest[6209:1409385] 执行了NSTimer

2015-03-19 16:35:03.854 TimerTest[6209:1409386] delloc mytask=<MyTask: 0x174234900>{name = '(null)'}