wade-mac:fin_server_invest mac$ node
> var events =require('events')
undefined
> var eventEmitter = new events.EventEmitter();
undefined
> var ringBell = function ringBell()
... {
... console.log('ring ring ring');
... }
undefined
> eventEmitter.on('doorOpen', ringBell);
{ domain: null,
_events: { doorOpen: [Function: ringBell] },
_maxListeners: 10 }
> eventEmitter.emit('doorOpen')
ring ring ring
true
> var ringBB = function ringBB(name, age){
... console.log('bb', name, age);
... }
undefined
> eventEmitter.on('bbcry', ringBB);
{ domain: null,
_events:
{ doorOpen: [Function: ringBell],
bbcry: [Function: ringBB] },
_maxListeners: 10 }
> eventEmitter.emit('doorOpen');
ring ring ring
true
> eventEmitter.emit('bbcry', 'wade', 3);
bb wade 3
true
> var callDaddy = function callDaddy(name,age){
... console.log('call daddy', name, age);
... }
undefined
> eventEmitter.on('bbcry',callDaddy);
{ domain: null,
_events:
{ doorOpen: [Function: ringBell],
bbcry:
[ [Function: ringBB],
[Function: callDaddy] ] },
_maxListeners: 10 }
> eventEmitter.emit('bbcry', 'wade', 3);
bb wade 3
call daddy wade 3
true
>
