ETF基金申赎清单成分券信息

获取ETF基金每个交易日的跟踪的标的指数成分券清单，包含成分券的代码、简称、股票数量、现金替代标志、现金替代溢价比、固定替代金额等信息。收录了2006年以来的历史数据，数据更新频率为日。不输入日期则默认获取近两天的数据。

Obtain the component security list of the underlying index tracked by ETF funds on each trading day, including the code, abbreviation, stock quantity, cash substitution flag, cash substitution premium ratio, fixed substitution amount and other information of the component securities. Historical data since 2006 is included, with a daily update frequency. If no date is provided, the data of the most recent two trading days will be retrieved by default.