NodeJs--events

events

• EventEmitter
  事件发射与事件监听

var emitter = new events.EventEmitter();
emitter.on('someEvent',function(arg1,arg2){
  console.log('listenr1',arg1,arg2)
})
emitter.on('someEvent',function(arg1,arg2){
  console.log('listenr2',arg1,arg2)
})
emitter.emit('someEvent','a',1)
//listenr1 a 1
//listenr2 a 1

.on(event，listener)
.emit(event，arg..)
.once(event，listener)一个监听器只触发一次随后立即解除
.removeListener(event，listener)
.removeAllListener(event)

fs

.readFile(filename,[encoding],[callback(err,data)])异步
.readFileSync(filename,[encoding])同步
.resdOpen(path,flags,[mode],[callback(err,fd)])
.read(...)是open的更底层接口，手动管理缓冲区和文件指针

HTTP

服务器

http.server

var server = new http.Server()
server.on('request',function(req,res){
  ...
})
server.listen(3000)
//request 客户端请求时
//connection TCP连接时
//close 服务器关闭时
request=>createServer([requestListener])

http.serveRequest

HTTP请求的信息