useReducer有问题啊，没法更新

[yzw2017]

/*

• @Author: changcheng
• @LastEditTime: 2023-08-24 11:50:03 */ import * as React from "react"; import { createRoot } from "react-dom/client";

function reducer(state, action) { if (action.type === 'incremented_age') { return { age: state.age + 1 }; } return state }

function App() { const [state, dispatch] = React.useReducer(reducer, { age: 42 });

console.log(state)

function handleClick() { dispatch({ type: 'incremented_age' }) }

return ( <button onClick={handleClick}>{state.age} ); } const root = createRoot(document.getElementById("root")); root.render(<App />);