为啥系统自带范例，也用的是：Close呢？

szkpt

为啥系统自带范例，也用的是：Close呢？

Params
        Numeric FastLength( 12 );
        Numeric SlowLength( 26 );
        Numeric MACDLength( 9 );
        Numeric BuyLots(1);
Vars   
        NumericSeries MACDValue;
        NumericSeries AvgMACD;
        Numeric MACDDiff;
        Bool Condition1;
        Bool Condition2;
Begin
        MACDValue = XAverage( Close, FastLength ) - XAverage( Close, SlowLength ) ;       
        AvgMACD = XAverage(MACDValue,MACDLength);
        MACDDiff = MACDValue - AvgMACD;
        Condition1 = CrossOver(MACDValue, AvgMACD) ;
        Condition2 = MACDValue > 0;
        if (Condition1 And Condition2)
        {
                Buy(BuyLots,Close);
        }
End