main.ts

const About = {
  template: "<div>About view</div>",
  mounted: function() {
    console.log("Welcome to the About view");
    const userId = this.$route.params.id;

    if (userId) {
      console.log("You are viewing the user:", userId);
    }
  },
  destroyed: function() {
    console.log("Thanks for visiting to the About view");
  }
};