状态管理

1.jotai

import { atom, useAtom } from "jotai";

// Create your atoms and derivatives
const textAtom = atom("hello");
const uppercaseAtom = atom((get) => get(textAtom).toUpperCase());

// Use them anywhere in your app
const Input = () => {
  const [text, setText] = useAtom(textAtom);
  const handleChange = (e) => setText(e.target.value);
  return <input value={text} onChange={handleChange} />;
};

const Uppercase = () => {
  const [uppercase] = useAtom(uppercaseAtom);
  return <div>Uppercase: {uppercase}</div>;
};

// Now you have the components
const App = () => {
  return (
    <>
      <Input />
      <Uppercase />
    </>
  );
};

2.Redux Toolkit

counterSlice.js

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

export const counterSlice = createSlice({
  name: "counter",
  initialState: {
    value: 0,
  },
  reducers: {
    increment: (state) => {
      // Redux Toolkit allows us to write "mutating" logic in reducers. It
      // doesn't actually mutate the state because it uses the immer library,
      // which detects changes to a "draft state" and produces a brand new
      // immutable state based off those changes
      state.value += 1;
    },
    decrement: (state) => {
      state.value -= 1;
    },
    incrementByAmount: (state, action) => {
      state.value += action.payload;
    },
  },
});

export const { increment, decrement, incrementByAmount } = counterSlice.actions;

// The function below is called a thunk and allows us to perform async logic. It
// can be dispatched like a regular action: `dispatch(incrementAsync(10))`. This
// will call the thunk with the `dispatch` function as the first argument. Async
// code can then be executed and other actions can be dispatched
export const incrementAsync = (amount) => (dispatch) => {
  setTimeout(() => {
    dispatch(incrementByAmount(amount));
  }, 1000);
};

// The function below is called a selector and allows us to select a value from
// the state. Selectors can also be defined inline where they're used instead of
// in the slice file. For example: `useSelector((state) => state.counter.value)`
export const selectCount = (state) => state.counter.value;

export default counterSlice.reducer;

store

import { configureStore } from "@reduxjs/toolkit";
import counterReducer from "../features/counter/counterSlice";

export default configureStore({
  reducer: {
    counter: counterReducer,
  },
});

3.mobx

import React from "react";
import ReactDOM from "react-dom";
import { makeAutoObservable } from "mobx";
import { observer } from "mobx-react";

// Model the application state.
class Timer {
  secondsPassed = 0;

  constructor() {
    makeAutoObservable(this);
  }

  increase() {
    this.secondsPassed += 1;
  }

  reset() {
    this.secondsPassed = 0;
  }
}

const myTimer = new Timer();

// Build a "user interface" that uses the observable state.
const TimerView = observer(({ timer }) => (
  <button onClick={() => timer.reset()}>
    Seconds passed: {timer.secondsPassed}
  </button>
));

ReactDOM.render(<TimerView timer={myTimer} />, document.body);

// Update the 'Seconds passed: X' text every second.
setInterval(() => {
  myTimer.increase();
}, 1000);

4.vuex

import Vue from "vue";
import Vuex from "vuex";

Vue.use(Vuex);

export default new Vuex.Store({
  //数据，相当于data
  state: {},
  getters: {},
  //里面定义方法，操作state方发
  mutations: {},
  // 操作异步操作mutation
  actions: {},
  modules: {},
});

5.pinia

6.xstate