弱网与重连

import { createClient, Events } from '@ni-paas-im-web';

const client = createClient({ appkey: 'YOUR_APP_KEY', serverUrl: 'http://127.0.0.1:8080' });
let syncing = true;

client.addEventListener(Events.CONNECTING, () => setStatus('连接中'));
client.addEventListener(Events.CONNECTED, () => { setStatus('同步中'); syncing = true; });
client.addEventListener(Events.SUSPEND, () => setStatus('网络不稳定'));
client.addEventListener(Events.DISCONNECT, ({ reason }) => setStatus(`已断开：${reason}`));
client.addEventListener(Events.KICKED, ({ code, reason }) => {
  stopReconnect();
  logout(`被踢下线：${code} ${reason}`);
});

// 离线补发通过 MESSAGES 事件到达；收到 sync_done 后再标记同步完成
client.addEventListener(Events.MESSAGES, ({ messages, syncDone }) => {
  for (const message of messages) {
    if (!seen.has(message.messageId)) { // 按 messageId 去重（at-least-once）
      seen.add(message.messageId);
      store(message);
    }
  }
  if (syncDone || messages.some((m) => m.syncDone)) { syncing = false; setStatus('已同步'); }
});