text: import {adminRouterMap, constantRouterMap, studentRouterMap, teacherRouterMap} from 'src/router';
  
  /**
   * 通过meta.role判断是否与当前用户权限匹配
   * @param roles
   * @param route
   */
  function hasPermission(roles, route) {
    if (route.meta && route.meta.role) {
      return roles.some(role => route.meta.role.indexOf(role) >= 0)
    } else {
      return true
    }
  }
  
  /**
   * 递归过滤异步路由表，返回符合用户角色权限的路由表
   * @param asyncRouterMap
   * @param roles
   */
  function filterAsyncRouter(asyncRouterMap, roles) {
    const accessedRouters = asyncRouterMap.filter(route => {
      if (hasPermission(roles, route)) {
  
        if (route.children && route.children.length) {
          route.children = filterAsyncRouter(route.children, roles)
        }
        return true
      }
      return false
    })
    return accessedRouters
  }
  
  
  function getNowRouter(asyncRouterMap, to) {
    return asyncRouterMap.some(route => {
        if(to.path.indexOf(route.path) !==-1) {
            return true;
        }
        else if (route.children && route.children.length) { //如果有孩子就遍历孩子
          return  getNowRouter(route.children, to)
        }
    })
  
  }
  
  
  
  const permission = {
    state: {
      routers: constantRouterMap,
      addRouters: [],
      siderbar_routers:[],
    },
    mutations: {
      SET_ROUTERS: (state, routers) => {
        state.addRouters = routers;
        state.routers = constantRouterMap.concat(routers);
        // state.routers.forEach(function(e){
        //     if(e.name==="首页"){
        //     state.siderbar_routers=e;
              
        //     }
  
        // })
  
      },
       SET_NOW_ROUTERS: (state, to) => {
         
            
            // 递归访问 accessedRouters，找到包含to 的那个路由对象，设置给siderbar_routers
            console.log(state.addRouters)
          state.addRouters.forEach(e => {
            if(e.children&& e.children.length ){
             if( getNowRouter(e.children,to)===true)
                    state.siderbar_routers=e;
            }
        
          })
        
  
       }
  
    },
    actions: {
      GenerateRoutes({ commit }, data) {
          console.log('GenerateRoutes')
        return new Promise(resolve => {
          const { roles } = data
          let accessedRouters
          if (roles.indexOf('admin') >= 0) {
            accessedRouters = adminRouterMap
          } else if(roles.indexOf('student') >=0){
              accessedRouters = studentRouterMap;
          }else if(roles.indexOf('teacher') >=0){
              accessedRouters = teacherRouterMap;
          }else {
  
              accessedRouters = filterAsyncRouter(adminRouterMap, roles)
          }
  
  
          commit('SET_ROUTERS', accessedRouters);
          resolve();
        })
      },
   
    getNowRoutes({ commit }, data) {
        return new Promise(resolve => {
          //data => to
          commit('SET_NOW_ROUTERS', data);
          resolve();
        })
    },
     },
  };
  
  export default permission;
  