但是，我想添加第二个切片locationInfoSlice，它应该在addLocation()操作被调度时获取数据，使用列表中的最后一个位置。
如果我正确理解了你的帖子/问题，你实际上想派遣 * 一些 * 单一的行动，并做以下事情：

• 在state.locations数组中存储位置
• 处理一些异步操作/逻辑，以使用state.locations数组中的最后一个位置获取一些数据。

我怎么才能做到这一点？我考虑过extraReducers或asyncThunk，但没有得到正确的。
您可能需要使用两者。单独使用extraReducers是不行的，因为reducer函数是没有副作用的纯同步函数，例如：它们不能异步获取数据。我的建议是创建一个Thunk，它调度addLocation操作来更新state.locations的状态，并且还进行所需的数据获取，该数据获取可以返回一个值，该值将用于更新extraReducers中locationInfoSlice的状态。

import { createAsyncThunk } from '@reduxjs/toolkit';
import { addLocation } from '../locationsPersistentSlice';

export const addLocationAsync = createAsyncThunk(
  "locations/addLocationAsync",
  async (location, thunkApi) => {
    // dispatch to add new location
    thunkApi.dispatch(addLocation(location));

    try {
      // asynchronous fetch logic
      return data;
    } catch(error) {
      return thunkApi.rejectWithError(error);
    }
  },
);

import { createSlice } from '@reduxjs/toolkit';

const initialState = [];

const locationsPersistentSlice = createSlice({
  name: "locations",
  initialState,
  reducers: {
    addLocation(state, action) {
      state.push(action.payload);
    },
    clearLocations() {
      return initialState;
    },
  },
});

export const {
  addLocation,
  clearLocations,
} = locationsPersistentSlice.actions;

export default locationsPersistentSlice.reducer;

import { createSlice } from '@reduxjs/toolkit';
import { addLocationAsync } from './action';

const initialState = /* whatever this initial state value is */;

const locationInfoSlice = createSlice({
  name: "locationInfo",
  initialState,
  extraReducers: builder => {
    builder
      .addCase(addLocationAsync.fulfilled, (state, action) => {
        // update state with fetched data
      })
      .addCase(addLocationAsync.rejected, (state, action) => {
        // update state with error status???
      })
      .addCase(addLocationAsync.pending, (state, action) => {
        // set any pending/loading state
      });
  },
});

export default locationInfoSlice.reducer;

在UI中，它现在将调度addLocationAsync操作，而不是直接调度addLocation操作。

import { useDispatch } from 'react-redux';
import { addLocationAsync } from './action';

...

const dispatch = useDispatch();

...

dispatch(addLocationAsync(/* some location value */));

...