DIFF:EMA(CLOSE,12)-EMA(CLOSE,26);
DEA:EMA(DIFF,9);

DRAWBAND(DIFF,RGB(200,50,55),DEA,RGB(250,250,0)); //在通達信里，這樣看很直觀
MACD:2*(DIFF-DEA);

這個函數是用來干什么的？