代码地址：https://github.com/yi/events.lua
说明如下：
# events.lua
An event emitter implementation in lua, api similar to (http://nodejs.org/api/events.html)
## 如何使用 Usage
``` coffee
events = require "events"
person =
name: "Johnny"
age: "very old"
events.EventEmitter(person) -- make person an EventEmitter
handlers =
hello: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
helloOnce: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
helloToRemove: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
goodday: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
person\on "hello", handlers.hello
person\on "hello", handlers.helloToRemove
person\once "hello", handlers.helloOnce
person\on "goodday", handlers.goodday
person\emit "hello", person, 1 -- will fire: hello, helloToRemove, helloOnce
person\emit "hello", person, 2 -- will fire: hello, helloToRemove
person\off "hello", handlers.helloToRemove
person\emit "hello", person, 3 -- will fire: hello
person\emit "goodday", person, 1 -- fire goodday
person\removeAllListeners "hello"
person\emit "hello", person, 4 -- fire no-one
person\emit "goodday", person, 2 -- fire goodday
events.EventEmitter person, true --should output: table: 0x7fc142d70500 is already an EventEmitter
```
## 支持回调方法的弱引用，简化析构 Weak Reference Support
```coffee
person =
name: "Walker"
age: "long enough"
events.EventEmitter(person, true) -- (WEAK KEY) make person an EventEmitter
handlers =
hello: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
helloOnce: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
helloToRemove: (who, howmany)->
print " who:#{who.name}, #{howmany} times"
assert.are.equal who, person
person\on "hello", handlers.hello
person\on "hello", handlers.helloToRemove
person\once "hello", handlers.helloOnce
person\on "goodday", handlers.goodday
person\emit "hello", person, 1 -- will fire: hello, helloToRemove, helloOnce
handlers.hello = nil
collectgarbage "collect" -- handlers.hello should be gced
person\emit "hello", person, 2 -- only fire: helloToRemove
```
## Test
Test specs are written in (http://www.moonscript.com/) on (https://github.com/Olivine-Labs/busted)
To run tests, do:
```sh
busted -v spec/
```
```
