使用FCM在Ionic 1中推送通知

Question

我知道这是重复的问题，但是我在SO和Ionic论坛上都找不到任何解决方案，这就是为什么再次询问

我该如何在其中进行推送通知

我遵循此过程

1）创建项目

2）添加离子 cordova插件，添加cordova-plugin-fcm 并按照说明进行操作

https://www.ttmind.com/TechPost/Firebase-Cloud-Messaging-FCM-using-Cordova-FCM-Plugin

3）添加android平台并在浏览器和Android设备中运行，但显示错误

caught ReferenceError: FCMPlugin is not defined
app.js:11
Array.<anonymous> (ionic.bundle.js:56238)
onPlatformReady (ionic.bundle.js:2496)
onWindowLoad (ionic.bundle.js:2477)

在app.js中使用了此代码

FCMPlugin.onTokenRefresh(function(token){
            alert( token );
            var div = document.getElementById('divToken');
            div.innerHTML += token;
        });

        FCMPlugin.onNotification(
            function(data){
                if(data.wasTapped){
                    //Notification was received on device tray and tapped by the user.
                    alert( JSON.stringify(data) );
                }else{
                    //Notification was received in foreground. Maybe the user needs to be notified.
                    alert( JSON.stringify(data) );
                }
            },
            function(msg){
                console.log('onNotification callback successfully registered: ' + msg);
            },
            function(err){
                console.log('Error registering onNotification callback: ' + err);
            }
        );

但是请告诉我这个错误