how to get url parameters in vuejs code example

Example: url params vue

//we can configure the routes to receive data via the url
//first configure the route so it can receive data:

const routes=[
.
.
{path : '/page/:id?', name='page', component: Page},
.
.

//inside the Page component we can get the data:

  name:'Page',
  mounted(){
     this.url_data=this.$route.params.id;
    },
  data(){
   return{
     url_data: null
    };
  }
  
  
  //the data can be then used in the template section of the component
  <h2> {{url_data}}</h2>