1.下载 react-transition-group

npm i react-transition-group

2.引入

import { CSSTransition, TransitionGroup,SwitchTransition } from 'react-transition-group'

3.包裹需要切换路由的部分

<SwitchTransition className="transition_wrapper">
        <CSSTransition key={useLocation().pathname} unmountOnExit timeout={300} classNames='example'>
          <Outlet />
        </CSSTransition>
 </SwitchTransition>

4.css样式

.example-enter {
    opacity: 0;
}
 
.example-enter-active {
    opacity: 1;
    transition: opacity 300ms ease-in;
}
.example-enter-done {
    opacity: 1;
}
.example-exit {
    opacity: 1;
}
 
.example-exit-active {
    opacity: 0;
    transition: opacity 300ms ease-out;
}
.example-exit-done{
    opacity: 0;
}

完整代码

css代码