底部出现，通达信副图，本人一直在用，很不错

RSV:=(CLOSE-LLV(LOW,21))/(HHV(HIGH,21)-LLV(LOW,21))*100;
K:=SMA(RSV,7,1);
D:=SMA(K,3,1);
J:=3*K-2*D;
底部:CROSS(J,7.6),LINETHICK3;