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2024年1月23日发(作者：计算机二级c语言和python哪个难)

) } if (typeof === 'undefined') { throw new Error( 'Actions may not have an undefined "type" property. ' + 'Have you misspelled a constant?' ) } if (isDispatching) { throw new Error('Reducers may not dispatch actions.') } try { isDispatching = true currentState = currentReducer(currentState, action) } finally { isDispatching = false } const listeners = (currentListeners = nextListeners) for (let i = 0; i < ; i++) { const listener = listeners[i] listener() } return action }// //

依次注册中间件，通过compose函数层层包装dispatch函数export default function applyMiddleware(...middlewares) { return createStore => (...args) => { const store = createStore(...args) let dispatch = () => { throw new Error( `Dispatching while constructing your middleware is not allowed. ` + `Other middleware would not be applied to this dispatch.` ) } const middlewareAPI = { getState: te, dispatch: (...args) => dispatch(...args) } const chain = (middleware => middleware(middlewareAPI)) dispatch = compose(...chain)(ch) return { ...store, dispatch } }}63.

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本文标签： 函数 计算机 层层 包装 中间件

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