exchange.SetContractType设置this_week和next_week，获取GetPosition无效

代码如下： for (i = 0; i < 2; i++) { exchange.SetContractType(ContractTypes[i]); var positions = exchange.GetPosition(); Log('148: ', positions); }

代码日志如下，也就是两次获取position都是this_week的，而期望获取this_week和next_week的持仓信息： 2018-05-06 09:22:00 信息 148: [{“Price”:23.15,“Amount”:3,“FrozenAmount”:0,“Profit”:0.11199735,“Margin”:0.12958962,“MarginLevel”:10,“Type”:0,“ContractType”:“this_week”}] 2018-05-06 09:22:00 信息 148: [{“Price”:23.15,“Amount”:3,“FrozenAmount”:0,“Profit”:0.11199735,“Margin”:0.12958962,“MarginLevel”:10,“Type”:0,“ContractType”:“this_week”}]

哪位大神可以帮忙解答以上问题，多谢多谢！！！