reducer里的代码：

function showMyList(showMine = defaultState.showMine, action) {
  switch (action.type) {
    case types.SET_MY_LIST:
      return action.showMine
    default:
      return showMine
  }
}

actions里的代码：

export function setMyList(showMine) {
  return {
    type: types.SET_MY_LIST,
    showMine
  }
}

index.js里的代码

const store = createStore(
  reducer,
  compose(
    applyMiddleware(thunk),
    window.devToolsExtension ? window.devToolsExtension() : f => f //开启redux调试
  )
)

//映射dispatch到props上

const mapDispatchToProps = dispatch => ({
  setMyList: status => {
    console.log(dispatch)
    dispatch(setMyList(status)); // dispatch is not a function
  }
});
export default connect(mapDispatchToProps)(Nav)

这里dispatch打印出来是state里的初始数据，是一个对象，哪里出问题了
redux、react-redux为最新版本