function onTick() {
exchange.SetContractType("v000");
var records = _C(exchange.GetRecords);

var last_records = records[records.length-2];//上一根K线数
var last_Close = last_records[Close];//上一根K线数
Log(last_Close)
}
回测结果是这样
main:24:35 - ReferenceError: Close is not defined
这是啥情况？