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求助:关于周期事件的使用问题



请问各位大神,周期事件是怎么使用的?我在 performPeriodicTask( void )这个函数中直接加了个透传的程序,怎么没有反应啊 ,而且还有Warning[Pe177]: function "performPeriodicTask" was declared but never referenced 这个警告,请问这个究竟是怎么回事啊?