Pusher 事件被触发两次

Question

每当管理员发送通知时，我都会使用 Pusher (pusher.com) 向所有登录的客户端触发通知。

由于某种原因，该事件拍摄了两次，尽管我只触发了一次。

客户端订阅代码：

var handleToastrListener = function() {

     var pusher = new Pusher("913284db62a0cc237db4");
     var channel = pusher.subscribe('toastr-channel');

           channel.bind('new-toast', function(data) {

            toastr.options = data.options;
            var $toast = toastr[data.scf](data.msg, data.title);

           return true;

           });  
   }

       handleToastrListener();

服务器端发布代码（PHP使用pusher包）：

 $pusher = new Pusher(PUSHER_KEY, PUSHER_SECRET, PUSHER_APP_ID);
 $pusher->trigger('toastr-channel', 'new-toast', $input );

Pusher 调试控制台显示仅收到一条消息。

pusher-js Javascript 日志记录显示两条消息：

Pusher : Event recd : {"event":"new-toast","data":{"options":{"positionClass":"toast-top-right","onclick":"","showDuration":"1000","hideDuration":"1000","timeOut":"5000","extendedTimeOut":"1000","showEasing":"swing","hideEasing":"linear","showMethod":"fadeIn","hideMethod":"fadeOut"},"title":"Toastr Notifications","msg":"Gnome & Growl type non-blocking notifications","scf":"success"},"channel":"toastr-channel"} app.js:143
Pusher : Event recd : {"event":"new-toast","data":{"options":{"positionClass":"toast-top-right","onclick":"","showDuration":"1000","hideDuration":"1000","timeOut":"5000","extendedTimeOut":"1000","showEasing":"swing","hideEasing":"linear","showMethod":"fadeIn","hideMethod":"fadeOut"},"title":"Toastr Notifications","msg":"Gnome & Growl type non-blocking notifications","scf":"success"},"channel":"toastr-channel"}

进一步观察，我发现订阅发生了两次，尽管我只调用了一次：

Pusher : Event sent : {"event":"pusher:subscribe","data":{"channel":"toastr-channel"}} app.js:143
Pusher : Event recd : {"event":"pusher_internal:subscription_succeeded","data":{},"channel":"toastr-channel"} app.js:143
Pusher : No callbacks on toastr-channel for pusher:subscription_succeeded app.js:143
Pusher : State changed : connecting -> connected app.js:143
Pusher : Event sent : {"event":"pusher:subscribe","data":{"channel":"toastr-channel"}} app.js:143
Pusher : Event recd : {"event":"pusher_internal:subscription_succeeded","data":{},"channel":"toastr-channel"} app.js:143
Pusher : No callbacks on toastr-channel for pusher:subscription_succeeded 

Answer 1

您绝对应该查看并适当更新您的问题的两件事：

1. Pusher 调试控制台 - 事件在其中显示两次吗？
2. pusher-js JavaScript 日志记录 - 事件是否被记录为 incoming 两次？

这里的另一个常见问题是，有时事件可能被绑定到两次 - 因此，有两个回调。但是，您的代码并不表明这种情况正在发生。

Answer 2

要解决这个问题，需要在绑定之前先解绑通道。

pusherClient.subscribe(1234);
pusherClient.bind(1234);
pusherClient.bind("incoming-message", (text) => {
  console.log(text);
});

请参阅此处了解更多信息。