VAR1:=(2*CLOSE+HIGH+LOW+OPEN)/5;
高抛: 80;
VAR2:=LLV(LOW,34);
VAR3:=HHV(HIGH,34);
SK: EMA((VAR1-VAR2)/(VAR3-VAR2)*100,13);
SD: EMA(SK,3);
低吸: 20;
强弱分界: 50;
