• 事件广播 发送方调用emit方法，接收方调用on方法，无论发送方或是接收方，都会工作在一个频道

声明了一个模块，用于读取mime.json中的记录var fs = require(‘fs‘);var events = require(‘events‘);var eventemitter = new events.EventEmitter();var getmimetype = function (path,eventemitter,suffix) { fs.readFile(path,function (err,data) { if(err){ console.log(err); return false; } var filedata = JSON.parse(data.toString()); eventemitter.emit(‘wenwa‘,filedata[suffix]); //console.log(filedata[suffix]) })};module.exports = getmimetype;

• 接收方

也就是在另一个文件中调用写好的模块，并声明广播的接收方var eventer = require(‘./readfile_events‘);var fs = require(‘fs‘);var events = require(‘events‘);var eventemitter = new events.EventEmitter();eventer(‘./mime.json‘,eventemitter,‘.css‘);eventemitter.on(‘wenwa‘,function (data) { console.log(data)});

• 回调函数

//定义模块
var fs = require(‘fs‘);var gettype = function (suffix,callback) { fs.readFile(‘./mime.json‘,function (err,data) { if(err){ console.log(err); return false; } var filedata = JSON.parse(data.toString()); //console.log(filedata[suffix]); callback(filedata[suffix]) })};module.exports = gettype;

//调用模块
var gettype = require(‘./readfilecallback.js‘);var fs = require(‘fs‘);var events = require(‘events‘);var eventemitter = new events.EventEmitter();gettype(‘.323‘,mycallback);function mycallback(data) { console.log(data)}