我们大部分的使用逻辑（包括useState、useCallback等，全部使用）都是写在react-dom库中的，但是ReactCurrentDispatcher的部分逻辑在react库中。本文主要梳理一下ReactCurrentDispatcher对象在整个react中的作用在react库中定义了全局变量：/***跟踪当前dispatcher.*/varReactCurrentDispatcher={/***@internal*@type{ReactComponent}*/current:null};//...许多行之后varReactSharedInternals$1={ReactCurrentDispatcher:ReactCurrentDispatcher,ReactCurrentOwner:ReactCurrentOwner,IsSomeRendererActing:IsSomeRendererActing,ReactCurrentBatchConfig:ReactCurrentBatchConfig,//UlingobjunderstotwiceinUMDbundle:assign:assign,//重新导出UMD包的调度API。//这避免了在次要更新中引入对新UMD全局的依赖，//因为这将是一个重大更改（例如，对于所有现有的CodeSandbox）。//只有UMD包需要重新导出；//CJS包使用共享的NPM包。调度器：调度器，SchedulerTracing：调度器跟踪};//...导出后多行。__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED=ReactSharedInternals$1;Inreact-dom,thereisthisimportedvalue:varReactSharedInternals=React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;//...manylineslatervarReactCurrentDispatcher=ReactSharedInternals.React/$varCurrentRespatch...manylineslater;=ReactSharedInternals.ReactCurrentDispatcher,ReactCurrentBatchConfig$1=ReactSharedInternals.ReactCurrentBatchConfig;ReactCurrentDispatcher$1，其实就是一个对象对象内只有一个key：currentReactCurrentDispatcher的作用，其实就是用来保存以下对象的：HooksDispatcherOnMountInDEVHooksDispatcherOnMountWithHookTypesInDEVHooksDispatcherOnUpdateInDEVHooksDispatcherOnRerenderInDEVInvalidNestedHooksDispatcherOnMountInDEVInvalidNestedHooksDispatcherOnUpdateInDEVInvalidNestedHooksDispatcherOnRerenderInDEV而这些对象中，都实现完整的一套use.代码结构大纲是这样的：ReactCurrentDispatcher={HooksDispatcherOnMountInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他use},HooksDispatcherOnMountWithHookTypesInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他使用},HooksDispatcherOnUpdateInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他use},HooksDispatcherOnRerenderInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他use},InvalidNestedHooksDispatcherOnMountInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他use},InvalidNestedHooksDispatcherOnUpdateInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他使用},InvalidNestedHooksDispatcherOnRerenderInDEV:{useState:function(){...},useCallback:function(){...},useEffect:function(){...},...其他用途},};当然，代码是公共的，逻辑部分是分开的，没有多余的逻辑和代码。我们将在本文中讲解hooktype，即ReactCurrentDispatcher的实现逻辑：reacthookscore:hooktype和ReactCurrentDispatcher
