<NavLink to="/home1" activeClassName="selected"> 主页一</NavLink>
        <NavLink activeStyle={{
            fontWeight: 'bold',
            color: 'red'}}
          to="/home2"> 主页二
        </NavLink>

index.js:1 Warning: React does not recognize the `activeClassName` prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase `activeclassname` instead. If you accidentally passed it from a parent component, remove it from the DOM element.