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ETF 的涨跌幅写死返回None

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![1721549711961](https://github.com/user-attachments/assets/527bea37-e2ef-4016-a30e-c942d3ce9e3c) ![1721549781578](https://github.com/user-attachments/assets/f0ec4a17-2b54-46a8-a93a-2142959e7116) 获取etf实时交易数据时，change和change_pct写死返回了None耶

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