引入radon-ui后，在router.beforeEach添加 transition.to.router.app.$Loading.start();报错如下

[xiaochegnzi0]

引入
import { RadonInstall } from 'radon-ui'于main.js中

Vue.use(RadonInstall, {
LoadingBar: true
})
在beforeEach中添加loading报错 “ Cannot read property 'router' of undefined”
router.beforeEach((transition) => {
transition.to.router.app.$Loading.start();
transition.next();
});
请大神帮忙看看