历史涨跌停的读取,按照示例在888上能实现，但在777上不能实现，求777上读取历史涨跌停的方法

按照 https://tbq.tbquant.net/helper?product_id=999&keyword=3507&content_id=277&type=article#%E5%8E%86%E5%8F%B2%E6%B6%A8%E8%B7%8C%E5%81%9C%E7%9A%84%E8%AF%BB%E5%8F%96 示例 //计算涨跌停价格 Numeric myjump=MinMove*pricescale; If(ExchangeCode=="CZCE") { myuplimit=RoundUp(mysettleprice[0][0]*(1+0.01*mypricelimit[0][0])/myjump,0)*myjump; mydnlimit=RoundDown(mysettleprice[0][0]*(1-0.01*mypricelimit[0][0])/myjump,0)*myjump; }Else If(ExchangeCode=="DCE") { myuplimit=RoundDown(mysettleprice[0][0]*(1+0.01*mypricelimit[0][0])/myjump,0)*myjump; mydnlimit=RoundUp(mysettleprice[0][0]*(1-0.01*mypricelimit[0][0])/myjump,0)*myjump; }Else If(ExchangeCode=="SHFE") { myuplimit=RoundDown(mysettleprice[0][0]*(1+0.01*mypricelimit[0][0])/myjump,0)*myjump; mydnlimit=RoundDown(mysettleprice[0][0]*(1-0.01*mypricelimit[0][0])/myjump,0)*myjump; }Else If(ExchangeCode=="CFFEX") { myuplimit=RoundDown(mysettleprice[0][0]*(1+0.01*mypricelimit[0][0])/myjump,0)*myjump; mydnlimit=RoundUp(mysettleprice[0][0]*(1-0.01*mypricelimit[0][0])/myjump,0)*myjump; } If(myuplimit<=mydnlimit) Return; //PlotNumeric("myuplimit",myuplimit); //PlotNumeric("mydnlimit",mydnlimit); Commentary("合约涨停价="+Text(myuplimit)+", 跌停价="+Text(mydnlimit)); 以上代码在888上能实现历史涨跌停价的获取但在777上却不能实现历史涨跌停价的获取。求777上获取历史涨跌停价的方法，谢谢