实现如下：
import React, {useContext, useState} from 'react';
import {ctx, Provider} from '....因此需要借助useContext来访问setUnreadIndex，将对应的状态重置。...import React, { useState, useEffect, useContext } from 'react';
import {zhLastFeedApi, Feed} from '....import React, { useState, useEffect, useContext } from 'react';
import {topViewApi} from '....import React, { useContext } from 'react';
import { List, Stepper } from 'antd-mobile';
import {ctx}
