js BroadcastChannel 小案例（未测试）

export const ContractBroadcastChannel = class {
  channelName: string;
  channel: BroadcastChannel;
  constructor() {
    this.channelName = 'ContractChannel';
    this.channel = window.BroadcastChannel ? new BroadcastChannel(this.channelName) : null;
  }
  postMessage = (data) => {
    return this.channel?.postMessage(data);
  };
  onMessage = (data) => {
    return this.channel?.onmessage(data);
  };
};