我使用keycloak-js版本8.0.1，我有一个函数getToken，它测试令牌是否过期，如果过期，它会刷新它，或者令牌没有过期，它会返回它。

令牌服务

@Injectable()
export class TokenService {

static auth: any = {};

constructor() { }

 static init(): Promise<any> {
    const keycloakAuth: Keycloak.KeycloakInstance = Keycloak({
        url: config.keycloak.url,
        realm: config.keycloak.realm,
        clientId: config.keycloak.clientId
    });
    return new Promise((resolve, reject) => {
        keycloakAuth.init({ onLoad: 'check-sso', flow: 'implicit', checkLoginIframe: false }).success(() => {
            TokenService.auth.authz = keycloakAuth;
            resolve();
        }).error(() => {
            reject();
        });
    });
 }

 getToken(): Promise<string> {
    return new Promise<string>((resolve, reject) => {
        if (TokenService.auth.authz.isTokenExpired()) {
             console.warn("Token expired !");
            TokenService.auth.authz.updateToken(1800).success(() => {
                console.log("Token updated");
                resolve(<string>TokenService.auth.authz.token);
            }).error(() => {
                reject('Failed to refresh token');
            });
        } else {
            resolve(<string>TokenService.auth.authz.token);
        }
    });
 }
}