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：

就像這樣：

<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>

解決辦法很簡單，把<div>換成<Fragment>就行了~

END!