参数后面使用 ？

id 后面加个 ‘ ? ’ ，将 id 设置为可选参数

{
    name: "index",
    path: '/p/:id?',
    component: resolve =>void(require(['../components/admin/layout/index.vue'], resolve))
}
//  ==
{ path: '/p/:id?', name: 'index', component: Index}