Just look at the estimated net value of the fund, that is, the trend of the fund on that day. As long as you look at the estimated net value of the fund at the close, you can judge the rise and fall of the fund on that day. Take Alipay as an example: open Alipay App-click "Funds"-select a fund-click "Net Value Estimation".

Fund income mainly depends on the net value of the fund. If the fund net value rises, it will gain, while if the fund net value falls, it will lose.