Mozilla Firefox扩展Javascript

Question

I am new to Firefox extension. I am not able to understand the following piece of code. Can anyone please explain this.

var httpRequestObserver =

{

observe: function(subject, topic, data)
                    .
                    .

}

I want to know what does "httpRequestObserver" and "observe" function does. I am also searching for tutorials for the same, but couldn't find any. It will be really helpful if someone can provide tutorials for the same.

Thanks in advance.

Answer 1

Have a look at this page at MDN which has sample code related to your example.

Your httpRequestObserver is an object that will probably later be "registered" to the application Observer Service for notifications on a specific topic , for example http-on-modify-request .

Each time a request is sent, the Observer Service will loop through the list of registered objects for the http-on-modify-request topic and will call their observe method. This gives the objects a chance to do something with the request before it is actually sent, like adding a custom HTTP header.