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在React Hooks中,可以結(jié)合使用useContext和useReducer來(lái)實(shí)現(xiàn)全局狀態(tài)管理。useContext用于獲取全局狀態(tài),而useReducer用于更新全局狀態(tài)。
首先,可以創(chuàng)建一個(gè)Context對(duì)象來(lái)存儲(chǔ)全局狀態(tài)和dispatch函數(shù):
import React, { createContext, useContext, useReducer } from 'react';
const initialState = {
count: 0,
};
const reducer = (state, action) => {
switch(action.type) {
case 'INCREMENT':
return { count: state.count + 1 };
case 'DECREMENT':
return { count: state.count - 1 };
default:
return state;
}
};
const GlobalContext = createContext();
const GlobalProvider = ({ children }) => {
const [state, dispatch] = useReducer(reducer, initialState);
return (
<GlobalContext.Provider value={{ state, dispatch }}>
{children}
</GlobalContext.Provider>
);
};
const useGlobalContext = () => {
return useContext(GlobalContext);
};
export { GlobalProvider, useGlobalContext };
然后,在組件中使用useGlobalContext來(lái)獲取全局狀態(tài)和dispatch函數(shù):
import React from 'react';
import { useGlobalContext } from './GlobalContext';
const Counter = () => {
const { state, dispatch } = useGlobalContext();
const handleIncrement = () => {
dispatch({ type: 'INCREMENT' });
};
const handleDecrement = () => {
dispatch({ type: 'DECREMENT' });
};
return (
<div>
<h1>Count: {state.count}</h1>
<button onClick={handleIncrement}>Increment</button>
<button onClick={handleDecrement}>Decrement</button>
</div>
);
};
export default Counter;
這樣就可以在整個(gè)應(yīng)用中共享狀態(tài),并且通過(guò)dispatch函數(shù)來(lái)更新全局狀態(tài)。
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