React 18 自定义 Hook 获取 useState 最新值

原理：通过同步更新 useRef 来获取最新值

// util.ts

export const useRefState = (init: any = null) => {

const [state, setState] = useState(init);

const stateRef = useRef(init);

const setProxy = (newVal: any) => {

stateRef.current = newVal;

setState(newVal);

};

const getState = () => stateRef.current;

return [state, setProxy, getState];

};

使用：

import { useRefState } from "util"

const [state, setState, getState] = useRefState(0)

state // state 值，变动后更新DOM

setState // setState，变动 state

getState() // 获取最新值

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