本地环境功能已正常运行。发布到 test 环境后，前台无反应。test 环境 redis，puma 正常，后台可以看到广播发送了。这是我的前端订阅消息的代码：

var Notices = React.createClass({
  getInitialState: function() {
    return {
      requests: []
    };
  },

  renderRequest: function(request) {
    return (
      <li>
        <a href="#">
          <div>
            <i className="fa fa-tasks fa-fw"></i> {request.id}
            <span className="pull-right text-muted small">{request.created_at}</span>
          </div>
        </a>
      </li>
    );
  },

  componentDidMount: function() {
    this.setupSubscription();
  },

  updateRequests: function(request) {
    var requests = React.addons.update(this.state.requests, { $push: [request]});
    this.setState({requests: requests, style: {color: 'red'}});
  },

  setupSubscription: function(){
    App.requests = App.cable.subscriptions.create("RequestsChannel", {
      received: function (data) {
        this.updateRequests(data.request);
      },

      updateRequests: this.updateRequests
    });
  },

  check: function() {
    this.setState({style: {color: ''}});
  },

  render: function() {
    return (
      <div onClick={this.check}>
        <a className="dropdown-toggle" data-toggle="dropdown" href="#" style={this.state.style}>
          <i className="fa fa-bell fa-fw"></i>{this.state.requests.length > 0 ? this.state.requests.length : null}
        </a>
      </div>
    );
  }
});

求指导！如果需要额外信息请留言。