不可以，thisclose是交易控制符不能添加其他值。

您得用  limit,DYNAINFO( 20)限價，但這類行情函數沒有歷史值所以您代碼要做下處理。

if  ISLASTBAR then buy(cond,v,limit,DYNAINFO( 20)-mindiff)              //當前最后一根k時根據為委買價-mindiff    

buy(cond,v,limit,c-mindiff)                                                              //歷史信號根據收盤價-mindiff

更正下漏了個else

if  ISLASTBAR then buy(cond,v,limit,DYNAINFO( 20)-mindiff);              //當前最后一根k時根據為委買價-mindiff    
else buy(cond,v,limit,c-mindiff)                                                         //歷史信號根據收盤價-mindiff