OnBar(ArrayRef<Integer> indexs) {

If(GetDicTime(fRollover, 0) <> GetDicTime(fRollover, 1) And fRollover[0][1] <> InvalidString And fRollover[0][2] <> InvalidString) {        

If( MarketPosition == 1) {

Lots = CurrentContracts;

Sell( 0,  Value(fRollover[0][1]), Enum_Signal_UnCorrectPrice );

Buy( Lots, Value(fRollover[0][2]), Enum_Signal_UnCorrectPrice );

Alert(DateTimeToString(Date + Time) + \" Sell\" + SymbolName + \"原 \" + fRollover[0][1]);

Alert(DateTimeToString(Date + Time) + \" Buy \" + SymbolName + \"新 \" + fRollover[0][2]);

}Else If( MarketPosition == -1) {

Lots = Abs(CurrentContracts);

BuyToCover( 0,  Value(fRollover[0][1]), Enum_Signal_UnCorrectPrice );

SellShort( Lots, Value(fRollover[0][2]), Enum_Signal_UnCorrectPrice );

Alert(DateTimeToString(Date + Time) + \" BuyToCover\" + SymbolName + \"原 \" + fRollover[0][1]);

Alert(DateTimeToString(Date + Time) + \" SellShort \" + SymbolName + \"新 \" + fRollover[0][2]);

}

}  

}

帮我看看我这样写的商品换月代码有什么问题吗？