这是一个Codesandbox。

getIDs()更新cells，然后需要更新initializeCells()。但是，此更改不会在分发操作后反映出来。尽管如此，我可以在Redux 开发工具上看到 action 已经通过，并且 的值cells也相应地发生了变化。gameStart()正在通过 props 传递给cells一个子组件，并通过useEffect()钩子在那里调用。我需要传递一个空数组作为这个钩子的第二个参数，否则它将永远运行，因为每次调用它时状态都会更新。问题是新状态getIDs()在第一次运行后不适用于以下功能。似乎是gameStart()完全完成并再次被调用的时候。我需要initializeCells()在getIDs()完成后立即更新需要更新的状态。

细胞.js

import React, { useEffect } from "react";
import { useSelector } from "react-redux";

import Cell from "./Container/Container/Cell";

const Cells = props => {
  const board = useSelector(state => state.board);

  useEffect(() => {
    props.gameStart();
  }, []);

  return (
    <div id="cells">
      {board.map(cell => {
        return (
          <Cell
            id={cell.id.substring(1)}
            key={cell.id.substring(1)}
            className="cell"
          />
        );
      })}
    </div>
  );
};

export default Cells;

应用程序.js

import React, { useEffect } from "react";
import { useSelector, useDispatch } from "react-redux";

import {
  setCells,
  setBoard
} from "../../redux/actions/index";

const Game = () => {
  const dispatch = useDispatch();

  const cells = useSelector(state => state.cells);
  const board = useSelector(state => state.board);
  const boardSize = useSelector(state => state.boardSize);

  async function gameStart() {
    await getIDs();
    console.log(cells); // []
    await initializeCells();
    await assignSnake();
    await placeFood();
    await paintCells();
  }

  function getIDs() {
    let cellID = "";
    let collection = [];

    for (let i = 1; i <= boardSize.rows; i++) {
      for (let j = 1; j <= boardSize.columns; j++) {
        cellID = `#cell-${i}-${j}`;

        collection.push(cellID);
      }
    }
    dispatch(setCells(collection));
    console.log(cells); // []
  }

  function initializeCells() {
    console.log(cells); // []
    const board = [];
    // for loop never runs because cells is empty
    for (let i = 0; i < cells.length; i++) {
      board.push(cell(cells[i]));
    }
    dispatch(setBoard(board));
    console.log("Board: ", board); // []
  }

  function cell(id) {
    return {
      id: id,
      row: id.match("-(.*)-")[1],
      column: id.substr(id.lastIndexOf("-") + 1),
      hasFood: false,
      hasSnake: false
    };
  }

  return (
  ...
  )
}

export default Game;

减速器/ index.js

import {
  SET_CELLS,
  SET_BOARD
} from "../constants/action-types";

const initialState = {
  board: [],
  cells: [],
  boardSize: {
    rows: 25,
    columns: 40
  }
};

const rootReducer = (state = initialState, action) => {
  switch (action.type) {
    case SET_CELLS:
      return Object.assign({}, state, {
        cells: action.payload
      });

    case SET_BOARD:
      return Object.assign({}, state, {
        board: action.payload
      });

    default:
      return state;
  }
};

动作/ index.js

import {
  SET_CELLS,
  SET_BOARD
} from "../constants/action-types";

export const setCells = payload => {
  return { type: SET_CELLS, payload };
};

export const setBoard = payload => {
  return { type: SET_BOARD, payload };
};

常量/动作类型.js

export const SET_CELLS = "SET_CELLS";
export const SET_BOARD = "SET_BOARD";