NthCon函数取不到上次条件

If (Close < LLL And Close[1] >= LLL[1]) { CROSSDOWN_LLL = True; Commentary("CROSSDOWN_LLL="+Text(IIF(CROSSDOWN_LLL==True,1,0))); } Commentary("NthCon(CROSSDOWN_LLL,1)="+Text(NthCon(CROSSDOWN_LLL,1)));请教下这里为什么下穿正常显示，NthCon函数取得的值却一直为0？