vue-router 导航守卫处理登录问题

//router/index.js

import store from "../store";

const router=new Router({...})

router. beforeEach(( to, from, next) => {

store. commit( 'GET_USERNAME');//做路由跳转前提交mutation（username）

const isLogin = store.state.userName;

if (to.name !== "login") {

if ( !isLogin) {

next({

path: "/login"

});

} else {

next();

}

} else {

sessionStorage. clear();

store. commit( 'GET_USERNAME');

next();

}

});