威廉趋势

买入：以短期线在低位上穿中期线和长期线为买入参考，配合五日均线拐头向上，低位有支撑为技术支持，则短趋势向上确认。

卖出：短期线在高位下穿中期线和长期线为卖出参考，配合5日均线拐头向下，高位有阻力出现，则短趋势向下确认。

A:=EMA(-100*(HHV(HIGH,34)-CLOSE)/(HHV(HIGH,34)-LLV(LOW,34)),19);

B:=-100*(HHV(HIGH,14)-CLOSE)/(HHV(HIGH,14)-LLV(LOW,14));

D:=EMA(-100*(HHV(HIGH,34)-CLOSE)/(HHV(HIGH,34)-LLV(LOW,34)),5);

短期线:B+100,colorred;

中期线:D+100,coloryellow;

长期线:A+100,colorgreen;

介入:IF(中期线<15,100,0),colorwhite;

15,POINTDOT;

80,POINTDOT;

A:=EMA(C,14),colorwhite,LINETHICK1;

B:=(A-REF(A,1))/REF(A,1)*100,NODRAW;

支撑:IF(B>=0,REF(EMA(C,14),BARSLAST(CROSS(B,0))+1),DRAWNULL),colorred,LINETHICK2;

阻力:IF(B<0,REF(EMA(C,14),BARSLAST(CROSS(0,B))+1),DRAWNULL),colorgreen,LINETHICK2;