路由前置守卫

 

const  writeList = ['/login','/404']
   
router.beforeEach(( to , from , next) => {

        // 获取到token (在vuex里放着)

       const  token = store.state.模块名.xxx
        
        if( token ) {
            
            if(to.path === '/login') {
                    
                next('跳转到主页')


            } else {
           
            next()
         
          }

      } else {

// 如果没有token 判断是否在白名单里 , 如果在next() , 不在跳到登录页
   
        if( writeList.includes(to.path)) {
             
                next()

       } else {
         
              next('/login')

      }

   
   }

})