送免费简单实用指标，简简单单俩根线，双线持有，单线空仓，大波段买卖点可以结合30和60K线
持仓参考
A:=MA(C,30);
A1:=A*1.1;
A4:=A*0.9;
A2:=A1-(A1-A4)*0.191;
持仓:IF(HIGH*1.01>A2 OR REF(HIGH,1)>REF(A2,1),A1,A4),LINETHICK3,COLOR00FF00;
IF(HIGH*1.01>A2 OR REF(HIGH,1)>REF(A2,1),A2,A4),LINETHICK3,COLORFFFFFF;
