document.cookie = "mylogin=1";//1:登陆成功；保存登录状态

main.js

router.beforeEach((to, from, next) => {    if (to.meta.requireAuth) { // 判断该路由是否需要登录权限    var login = 0;     console.log("--------------document-----------",document.cookie);    var ck = document.cookie.split(";");        for (var index = 0; index < ck.length; index++) {        var islogin = ck[index].split("=");        if (islogin[0].trim() == "mylogin") {            if (islogin[1] == 1) { //还在登录状态                login = 1;                break;            }        }    }    console.log("--------------login-----------",login);    if (login == 1) { //还在登录状态        next();    } else {        next({            path: '/',            name: 'login',            query: { redirect: to.fullPath }        })    }    } else {    next();    }})