4,20,62 经典的主图指标！！

ma62:ma(close,62);
drawtext(ma4 ref(ma4,1) and ma20 ref(ma20,1) and ma62 ref(ma62,1) and cross(ma4,ma20)and ATan(ma20-ref(ma20,1)/ref(ma20,1)) =30/1000,l-0.3,'★买'),coloryellow;