manager.go
func (dm *DirtyManager) Filter() DirtyFilter {
	dm.filterMux.RLock()
	filter := dm.filter
	dm.filterMux.RUnlock()
	return filter
}
func (dm *DirtyManager) Filter() DirtyFilter {
	dm.filterMux.RLock()
	filter := dm.filter
	dm.filterMux.RUnlock()
	return filter
}
// Filter 获取敏感词过滤接口