一个简单的布林带，收盘价大于小于判断                    

上一个 close小于下轨 就xgok=false，为什么图片上处没有赋值;

                        zhonggui = XAverage (Close ,zgs);

bzc = StandardDev (Close,zgs);

shanggui = zhonggui+bzc*2;

xiagui = zhonggui-bzc*2;

PlotNumeric(\"上轨\",shanggui);

PlotNumeric(\"中轨\",zhonggui);

PlotNumeric(\"下轨\",xiagui);

If(Close[1]>shanggui And Close[1]>zhonggui )

{

sgok=True;

xgok=False;

zgok=False;

}

If(Close[1] < xiagui And Close[1] <zhonggui)

{

xgok=True;

sgok=False;

zgok=False;

}

If(sgok And Close[1] <zhonggui And xgok==False) zgok=True;

If(xgok And Close[1] >zhonggui And sgok==False) zgok=True;

PlotBool(\"上升\",sgok);

//PlotBool(\"调整\",zgok);

//PlotBool(\"下降\",xgok);