query.js

import { ApiPromise, WsProvider } from '@polkadot/api';

async function subscribeTemplatePallet() {
  // 连接到 Polkadot 节点
  const provider = new WsProvider('ws://localhost:9944');
  const api = await ApiPromise.create({ provider });

  // 订阅 template pallet 中的值更新
  api.query.templateModule.something((result) => {
    console.log('Something updated:', result.toHuman());
  });

  // 订阅 template pallet 中的事件
  api.query.system.events((events) => {
    events.forEach((record) => {
      const { event } = record;

      if (event.section === 'templateModule' && event.method === 'SomethingStored') {
        console.log('SomethingStored event:', event.data.toString());
      }
    });
  });

  // 等待更新和事件
  await new Promise((resolve) => setTimeout(resolve, 60000));

  // 关闭连接
  api.disconnect();
}

subscribeTemplatePallet().catch(console.error);