先打出来全部代码

import React from 'react'
import createSore from '../store/store'

const isServer = typeof window === 'undefined'
const __NEXT_REUDX_STORE__ = '__NEXT_REUDX_STORE__'

function getOrCreateStore(initialState) {
  if (isServer) {
    return createSore(initialState)
  }

  if (!window[__NEXT_REUDX_STORE__]) {
    window[__NEXT_REUDX_STORE__] = createSore(initialState)
  }
  return window[__NEXT_REUDX_STORE__]
}

export default Comp => {
  class WithReduxApp extends React.Component {
    constructor(props) {
      super(props)
      this.reduxStore = getOrCreateStore(props.initialReduxState)
    }

    render() {
      // const name = name + '123'

      const { Component, pageProps, ...rest } = this.props

      // console.log(Component, pageProps)

      if (pageProps) {
        pageProps.test = '123'
      }

      return (
        <Comp
          Component={Component}
          pageProps={pageProps}
          {...rest}
          reduxStore={this.reduxStore}
        />
      )
    }
  }

  WithReduxApp.getInitialProps = async ctx => {
    const reduxStore = getOrCreateStore()

    ctx.reduxStore = reduxStore

    let appProps = {}
    if (typeof Comp.getInitialProps === 'function') {
      appProps = await Comp.getInitialProps(ctx)
    }

    return {
      ...appProps,
      initialReduxState: reduxStore.getState(),
    }
  }

  return WithReduxApp
}

在getInitialProps方法中返回了 { ...appProps, initialReduxState: reduxStore.getState(), }
所以 render()方法中`const { Component, pageProps, ...rest } = this.props`时，{...rest}如果扩展开的话应该是包含initialReduxState，再看以下render中的return内容

    return (
    <Comp
      Component={Component}
      pageProps={pageProps}
      {...rest}
      reduxStore={this.reduxStore}
    />

即传递了reduxStore，还传递了包含initialReduxState的{…rest}。这里不太明白的是,Comp组件可以获得reduxStore, 如果想查看store中state的话，可以调用store.getStore(). 那么还有必要在getInitialProps中传入initialReduxState吗？这个initialReduxState被传递进去的作用是什么呢？