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求高手編寫壹個文華財經指標,7上穿21均線笑臉,7下穿21均線哭臉,小弟拜謝!

MA7:7; MA21:21;

DRAWTEXT(CROSS(MA7,MA21),MA7-2,'買'),FONTSIZE18,COLORRED;

DRAWTEXT(CROSS(MA21,MA7),MA7+2,'賣'),FONTSIZE18,COLOR00FFFF;