there is navigation on the left and above. 
 wants the navigation not to move when you jump. 
 renders the contents of the child route on the lower right. 
 originally intended to use v-if to bind to the parent route element 
 Click on the link and render the child route 
 with else, but it doesn"t seem to work. After clicking in, the path jumps, but the page is blank 
this is the routing configuration:
{
            path: "/industries",
            name: "Industry",
            component: Industry,
            meta: {
                requireAuth: true
            },
            children: [
                {path: "/:id", component: Modify_industry}
            ]
        } because there are many elements in the first div below, I took a screenshot of 
  
 
