請(qǐng)寫出偿乖，下面的打印是？
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"1");
[self performSelector:@selector(pintLog) withObject:nil afterDelay:0];
//[self performSelectorOnMainThread:@selector(pintLog) withObject:nil waitUntilDone:false];//
// [self performSelectorInBackground:@selector(pintLog) withObject:nil];//
NSLog(@"3");
});
- (void)pintLog{
NSLog(@"2");
}
