同域名下，兩個網站通過cookie共享登錄注冊功能大概思路。

// 說明：本文件代碼以vue工程化項目為例，其他類型項目請自行微改!!!
// 導入js-cookie依賴
import Cookies from "js-cookie";
// 操作瀏覽器本地存儲
const storage = window.localStorage;

// 跳轉到官網登錄，登錄成功后會根據redirect參數，跳回之前的地址。
export function gotoLogin() {
  if (process.env.NODE_ENV === "development") {
    // 開發環境,需要在本地將官網的項目運行起來
    window.location.href =
      "http://localhost:8089/front/login/passwordlogin?redirect=" +
      window.location.href;
  } else {
    // 其他環境
    window.location.href =
      window.location.protocol +
      "//" +
      window.location.host +
      "/front/login/passwordlogin?redirect=" +
      window.location.href;
  }
}
// 跳轉到官網注冊，注冊成功后會根據redirect參數，跳回之前的地址。
export function gotoRegister() {
  if (process.env.NODE_ENV === "development") {
    // 開發環境,需要在本地將官網的項目運行起來
    window.location.href =
      "http://localhost:8089/front/register/inputmsisdn?redirect=" +
      window.location.href;
  } else {
    // 其他環境
    window.location.href =
      window.location.protocol +
      "//" +
      window.location.host +
      "/front/register/inputmsisdn?redirect=" +
      window.location.href;
  }
}
// 在本項目中獲取用戶是否登錄及登陸后的用戶信息
/*
 * 權限相關工具函數
 */
// ！！！！！！！！！！！！！notice
export const USER_AVATAR = "ticket_avatar";
export const USER_TITLENAME = "ticket_titlename";
export const USER_AUTH = "is_auth";
export const COOKIE_AVATAR = "avatar";
export const COOKIE_NICK = "nick";
export const COOKIE_STATUS = "status";
export const COOKIE_PHONE = "phone";

// 判斷用戶是否登錄 登錄返回值為true,沒登錄返回值為false
export function isLogin() {
  console.log("用戶狀態cookie:", Cookies.get("status"));
  if (
    Cookies.get("status") &&
    Cookies.get("status") === "0" &&
    Cookies.get("is_auth")
  ) {
    return true;
  }
  return false;
}
// 獲取用戶信息：頭像，昵稱，手機號，是否實名等
export function getBasicUserInfo() {
  const u = {};
  u.avatar = Cookies.get(COOKIE_AVATAR);
  u.nick = Cookies.get(COOKIE_NICK);
  u.showPhone = Cookies.get(COOKIE_PHONE);
  u.isAuth = Cookies.get(USER_AUTH);
  return u;
}

// 退出登錄,調用接口，刪除cookie
export function doLogout() {
  const url =
    window.location.protocol +
    "//" +
    window.location.host +
    "/passportservice/passport/logout";
  axios
    .get(url)
    .then((res) => {
      unAuth();
      console.log("退出登錄", res);
      this.$router.push({
        name: "login",
      });
    })
    .catch((response) => {
      console.log(response);
    });
}
/*
 * 退出登錄，刪除cookie及storage
 *
 * */
export function unAuth() {
  const opt = "";

  storage.removeItem(USER_AVATAR);
  storage.removeItem(USER_TITLENAME);
  storage.removeItem(COOKIE_PHONE);
  storage.removeItem(USER_AUTH);
  Cookies.remove(COOKIE_AVATAR, opt);
  Cookies.remove(COOKIE_NICK, opt);
  Cookies.remove(COOKIE_STATUS, opt);
  Cookies.remove(COOKIE_PHONE, opt);
  Cookies.remove(USER_AUTH, opt);
}

// 官網注冊登錄頁面，獲取url中redirect參數，並在登錄/注冊成功后跳轉回redirect對應的url

// 1, 獲取url中redirect參數的值，保存到瀏覽器sessionStorage中
mounted() {
  const redirectURL = this.$route.query.redirect
  if (redirectURL) {
    window.sessionStorage.setItem('redirectUrl', redirectURL)
  }
}

// 2, 登錄/注冊成功后，判斷sessionStorage中是否有redirectUrl，存在的話跳轉redirectUrl，不存在則跳轉到官網首頁
const redirectURL = window.sessionStorage.getItem("redirectUrl");
if (redirectURL && redirectURL.indexOf("login") === -1) {
  window.location.href = redirectURL;
  window.sessionStorage.removeItem("redirectUrl");
} else {
  return this.$router.push("/home");
}