-(void)runTimerInThread{    //NSAutoreleasePool,沒的用    [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doSth:) userInfo:self repeats:YES];        //1.以上方法自動把NSTimer添加到RunLoop里面        NSTimer* timer=[NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(doSth:) userInfo:self repeats:YES];        //2.以上方法不會自動NSTimer添加到RunLoop里面    [[NSRunLoop currentRunLoop]addTimer:timer forMode:NSDefaultRunLoopMode];    //要手動加入runLoop,額額,類方法就寫入了 addTimer:timer forMode:NSDefaultRunLoopMode;            [[NSRunLoop currentRunLoop]run];    //這很重要,把定時器的線程加入運行回環runloop才會使線程處于活躍狀態}

 [self performSelectorInBackground:@selector(runTimerInThread) withObject:nil];