①利用利用redirect单独写一个路由

  {
    path: "/",
    redirect: "/home",
  },
  {
    path: "/home",
    name: "home",
    component: () => import("../pages/Home/index.vue"), //这里是路由懒加载，使访问更加高效
  },
  {
    path:"/login",
    name:"login",
    component: () => import("../pages/Login/index.vue"),
  }

②router的children的初始页面，可以用redirect定义初始页面,也可以按①的方式

 {
    path: "/helloworld",
    name: "HelloWorld",
    component: HelloWorld,
    //进入时默认路由为"/1"
    redirect: "/1",
    children: [
      {
        path: "/1",
        name: "ahomepage",
        component: ahomepage,
      },
      {
        path: "/2",
        name: "one",
        component: one,
      },
      {
        path: "/3",
        name: "two",
        component: two,
      },
      {
        path: "/5",
        name: "NodeApi",
        component: NodeApi,
      },
      {
        path: "/4",
        name: "arcgis",
        component: arcgis,
      },
      {
        path: "/6",
        name: "Try",
        component: Try,
      },
      {
        path: "/7",
        name: "Echarts",
        component: Echarts,
      },
      {
        path: "/8",
        name: "GeoGIS",
        component: GeoGIS,
      },
      {
        path: "/9",
        name: "Less",
        component: less,
      },
    ],
  },