//view就是后台给的数据
return () => import(`@/view/modules/${view}`);

Router.addRoutes(路由数据)

import Vue from "vue";
import Router from "vue-router";
import AppMain from "@/view/modules/main/index";
Vue.use(Router);
export const _CONSTANTS_ROUTERS =
[
  {
    path: "/login",
    component: () => import("@/view/modules/login/index"),
    hidden: true
  },
  {
    path: "",
    component: AppMain,
    redirect: "/dashboard",
    children: [
      {
        path: "/dashboard",
        component: () => import("@/view/modules/dashboard/index"),
        name: "Dashboard",
        meta: { title: "首页", icon: "dashboard", noCache: true }
      }
    ]
  }
];
export default new Router({
  mode: "history",
  // 解决vue框架页面跳转有白色不可追踪色块的bug
  scrollBehavior: () => ({ x: 0, y: 0 }),
  // scrollBehavior: () => ({ y: 0 }),
  routes: _CONSTANTS_ROUTERS
});

Router.beforeEach((to, from, next) =>
{
  NProgress.start();
  if (!Token.isEmpty())
  {
    if (to.path === "/login")
    {
      next({ path: "/" });
      NProgress.done();
    }
    else if (to.path === "/404")
    {
      next();
      NProgress.done();
    }
    else
    {
      // 判断当前用户是否已拉取完角色信息
      if (Store.getters.roles.length === 0)
      {
         //拉取路由数据
ACLRepo.listMenuTreeOfCurrentUser().then(response =>
          {
            Store.dispatch("generateRoutes", response).then(() =>
            {
              // 根据roles权限生成可访问的路由表
              Router.addRoutes(Store.getters.addRouters); // 动态添加可访问路由表
              next({ ...to, replace: true }); // hack方法 确保addRoutes已完成 ,set the replace: true so the navigation will not leave a history record
            });
          });
      }
      else
      {
         next();
      }
    }
  }
  else
  {
    next();
  }
});

import { _CONSTANTS_ROUTERS } from "@/scripts/router";
import AppMain from "@/view/modules/main/index";
const _PERMISSION = {
  state: {
    routers: _CONSTANTS_ROUTERS,
    addRouters: []
  },
  mutations: {
    setRouters: (state, routers) =>
    {
      state.addRouters = routers;
      //和已经存在的路由表拼接
      state.routers = _CONSTANTS_ROUTERS.concat(routers);
    }
  },
  actions: {
    generateRoutes({ commit }, response)
    {
      let asyncRouters = filterAsyncRouter(response);
      asyncRouters.push({ path: "*", redirect: "/404", hidden: true });
      commit("setRouters", asyncRouters);
    }
  }
};
 
function filterAsyncRouter(routers)
{
  // 遍历后台传来的路由字符串，转换为组件对象
  let accessedRouters = routers.filter(router =>
  {
    if (router.meta)
    {
      // 默认图标处理
      router.meta.icon = router.meta.icon "component";
    }
    if (router.component === "main")
    {
      // Main组件特殊处理
      router.component = AppMain;
    }
    else
    {
      //处理组件---重点
      router.component = loadView(router.component);
    }
    //存在子集
    if (router.children && router.children.length)
    {
      router.children = filterAsyncRouter(router.children);
    }
    return true;
  });
  return accessedRouters;
}
function loadView(view)
{
  // 路由懒加载
  return () => import(`@/view/modules/${view}`);
}
export default _PERMISSION;