有沒有相關的課程可以學習，經常看api文檔看的理解不對，尤其是那些缺少實例代碼的。例如下面這一段http://docs.meteor.com/api/pubsub.html#Meteor-subscribeMeteor.subscribe(name, [arg1, arg2...], [callbacks])import { Meteor } from 'meteor/meteor' (ddp-client/livedata_connection.js, line 521)Subscribe to a record set. Returns a handle that provides stop() and ready() methods.ARGUMENTSname StringName of the subscription. Matches the name of the server's publish() call.arg1, arg2... EJSON-able ObjectOptional arguments passed to publisher function on server.callbacks Function or ObjectOptional. May include onStop and onReady callbacks. If there is an error, it is passed as an argument to onStop. If a function is passed instead of an object, it is interpreted as an onReady callback.實際使用callbacks的寫法應該是Meteor.subscribe("name",{ onReady:function(){//代碼}}但是從文中的描述來看我根本想不到實際的寫法應該是這樣，不知道應該怎么理解。有沒有系統的學習看api文檔的教程？求教！