LoginError

import ArRTM from "ar-rtm-sdk";
···
/**
 * 创建 RTM 客户端实例
 * @params demoAppId: Pass your App ID here.
 */
const client = ArRTM.createInstance("demoAppId", { enableLogUpload: false });

/**
 * 登陆 login
 * @params uid: Pass your user ID here.
 */
client.login({ uid: "userId" })
    .then(() => { })
    .catch((err) => {
        if (err.code === 4) {
            console.log("无效的 App ID");
        }
    });