vue报错[Vue warn]: Unknown custom element: <router-Link> - did you register the component correctly? For recursive components, make sure to provide the "name" option.

vue browser error, as follows

vue.runtime.esm.js?2b0e:619 [Vue warn]: Unknown custom element: <router-Link> - did you register the component correctly? For recursive components, make sure to provide the "name" option.

found in

---> <App> at src/App.vue
<Root>

 

the reason:

No registration plug-in router

// register the plug 
Vue.use (VueRouter)