短期:=100*(c-llv(l,5))/(hhv(c,5)-llv(l,5));
中期:=100*(c-llv(l,8))/(hhv(c,8)-llv(l,8));
中期a:=100*(c-llv(l,13))/(hhv(c,13)-llv(l,13));
中长期a:=100*(c-llv(l,21))/(hhv(c,21)-llv(l,21));
中短:=(短期+中期+中期a+中长期a)/4;
中长期:=100*(c-llv(l,34))/(hhv(c,34)-llv(l,34));
长期:=ema(中长期,13);
xg: 长期<20 and cross(中长期,长期);
