通达信大道至简《四线法则》

FL:=MA(CLOSE,17)+ABS(MA(CLOSE,17)-REF(MA(CLOSE,17),1)),COLORWHITE;
 FS:=MA(CLOSE,17)+MA(CLOSE,17)-REF(MA(CLOSE,17),1),COLORWHITE;
 BB:IF(MA(CLOSE,17)<FS,FS,MA(CLOSE,17)),COLORWHITE;
年线:=EMA(C,250);
 A:=BB-(EMA(C,3)-BB),COLORWHITE;
 DIFF:EMA((年线-(EMA(C,3)-年线)),5),LINETHICK2;
 IF(BB=FS,BB,BB), COLORWHITE,LINETHICK2;
追涨跌破止损: EMA(COST(81),10) COLORRED,LINETHICK2;
牛熊线: EMA(COST(27),120), CIRCLEDOT;

选股公式：

FL:=MA(CLOSE,17)+ABS(MA(CLOSE,17)-REF(MA(CLOSE,17),1)),COLORWHITE;
 FS:=MA(CLOSE,17)+MA(CLOSE,17)-REF(MA(CLOSE,17),1),COLORWHITE;
 BB:=IF(MA(CLOSE,17)<FS,FS,MA(CLOSE,17));
年线:=EMA(C,250);
 DIFF:=EMA((年线-(EMA(C,3)-年线)),5);
 CROSS(BB,DIFF);