1. If I understand it correctly, (if it is an icon, prepare two plots, one highlights and one does not highlight)
in the tag, use vMuif= "this.$route.path = 'routing path'" to judge;
if it is not a route, use window.location.href to read the current page URL, and then intercept the judgment.

2. Display the page directly and write {path: "/", redirect: component name} in the route. For example:
var router=new VueRouter ({

routes:[
    {path:'/',component:index},
    {path:'/main',component:main,
        children:[
            {path:'/',redirect:},    //URLxxx.com-sharp/main
            {path:'',component:}
            //...
        ]
     }

]

})