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add async
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‎doc/day3_node.md‎

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http://nodejs.org/
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## 熟悉Common JS写法
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### 最基本的写法
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```
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function pp(name){
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console.log('hello world 1:' + name);
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}
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module.exports = {
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hi:pp
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};
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```
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```
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function pp(name){
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console.log('hello world 2:' + name);
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}
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module.exports = pp
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```
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```
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var obj = {
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pp: function(name){
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console.log('hello world 3:' + name);
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}
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}
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module.exports = obj
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```
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测试代码
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```
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/* test 1 */
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var Hello = require('./helloworld')
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Hello.hi('kezhizhi');
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/* test 2 */
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require('./helloworld_2')('kezhizhi')
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/* test 3 */
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var Hello = require('./helloworld_3')
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Hello.pp('kezhizhi');
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```
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## 系统库
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在mac下建议使用Dash查看nodejs文档
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## 异步调用
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### 异步示例
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```
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var fs = require('fs')
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// 同步
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var filenames = fs.readdirSync(".");
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for (i = 0; i < filenames.length; i++) {
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console.log(filenames[i]);
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}
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console.log('Current uid: ' + process.getuid()+ "\n---------------------------");
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//异步
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fs.readdir(".", function (err, filenames) {
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var i;
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for (i = 0; i < filenames.length; i++) {
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console.log(filenames[i]);
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}
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});
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console.log('Current uid: ' + process.getuid() + "\n");
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```
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[更多](http://blog.csdn.net/yczz/article/details/7015463)
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### 异步编程模式
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see [q](https://github.com/kriskowal/q)
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`node_asycn/q/index.js`
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code
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```
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var Q = require('q')
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var fs = require('fs')
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require('colors');
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var fsReadFile_deferd = function(file,encoding){
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var deferred = Q.defer();
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fs.readFile(file,encoding,function(error,result){
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if(error){
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deferred.reject(error.toString().red);
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}
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deferred.resolve(result);
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});
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return deferred.promise;
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};
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var file = '../test.js'
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fsReadFile_deferd(file).then(function(result){
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console.log("invoke in deferd".red);
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console.log(result.toString().green);
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},function(error){
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console.log("invoke in deferd".red);
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console.log(error.toString().red);
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});
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```
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测试
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```
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node index.js
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```
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## 常用库
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- fs
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- utils
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## 总结

‎doc/demo/day1/node_asycn/q/index.js‎

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var Q = require('q')
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var fs = require('fs')
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require('colors');
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var fsReadFile_deferd = function(file,encoding){
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var deferred = Q.defer();
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fs.readFile(file,encoding,function(error,result){
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if(error){
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deferred.reject(error.toString().red);
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}
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deferred.resolve(result);
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});
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return deferred.promise;
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};
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var file = '../test.js'
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fsReadFile_deferd(file).then(function(result){
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console.log("invoke in deferd".red);
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console.log(result.toString().green);
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},function(error){
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console.log("invoke in deferd".red);
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console.log(error.toString().red);
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});

‎doc/demo/day1/node_asycn/q/node_modules/colors/.travis.yml‎

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‎doc/demo/day1/node_asycn/q/node_modules/colors/MIT-LICENSE.txt‎

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‎doc/demo/day1/node_asycn/q/node_modules/colors/ReadMe.md‎

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