完整的警告是：
Warning: React does not recognize the computedMatch prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase computedmatch instead. If you accidentally passed it from a parent component, remove it from the DOM element.

引起警告的原因是： 在react-router-dom的<Switch>中使用了<div>

就像这样：

<Router>
  <Switch>
    <div>
      <Route path="/" exact component={ Home} />
      <Route path="/newMeetings" exact component={ NewMeetings} />
      <Route path="/changeMeetings" exact component={ ChangeMeetings} />
      <Route path="/peopleSetting" exact component={ PeopleSetting} />
    </div>
  </Switch>
</Router>

解决办法很简单，把<div>换成<Fragment>就行了~

END!