Lowest取不到值

18516181234

代码如下：

1.         If(CrossUp)
   
2.         {
   
3.         PreDownLen1 = CountCrossDown1;
   
4.         PreDownLen2 = CountCrossDown2 - CountCrossUp2;
   
5.         Commentary("上一死叉周期数: "+Text(PreDownLen1));
   
6.         Commentary("上两死叉周期数: "+Text(PreDownLen2));
   
7.         LastPriceL1 = Lowest(Close, PreDownLen1); //上个死叉周期最低收盘价
   
8.         LastPriceL2 = Lowest(Close[CountCrossDown2], PreDownLen2); //上上个死叉周期最低收盘价
   
9.         Commentary("上一死叉周期数最低收盘价: "+Text(LastPriceL1));
   
10.         Commentary("上两死叉周期数最低收盘价: "+Text(LastPriceL2));
    
11.         }

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Lowest永远都是取当前周期的值，求解？..
万谢！

18516181234

编译和语法没有问题，就是取不到Lowest值，还请大神指点。