//-------------optfile.js-------------------------
var fs = require('fs');
module.exports = {
	readfileSync: function (path) { //同步讀取
		var data = fs.readFileSync(path, 'utf-8');
		console.log(data);
		console.log("同步方法執行完畢");
		return data;
	},
	readfile1: function (path, res) { //非同步執行
		fs.readFile(path, function (err, data) {
			if (err) {
				console.log(err);
			} else {
				console.log(data.toString());
				res.write(data);//報錯
			}
		});
		console.log("非同步方法執行完畢");
	},
	readfile2: function (path, recall) { //非同步執行
		fs.readFile(path, function (err, data) {
			if (err) {
				console.log("非同步執行error：" + err);
				recall("檔案不存在，非同步執行error：" + err);
			} else {
				console.log(data.toString());
				recall(data);
			}
		});
		console.log("===非同步方法執行完畢===");
	},
}
 

//-----------n5_readfile----讀取檔案---------------------
/*
 * 單執行緒非同步
 */
var http = require('http');
var optfile = require('./model/optfile1.js');
http.createServer(function (request, response) {
	response.writeHead(200, {
		'Content-Type': 'text/html;  charset=utf-8'
	});
	if (request.url !== "/favicon.ico") { //清除第2此訪問
		console.log('訪問');
		function recall(data) {//閉包函式、回撥函式
			console.log(data.toString());
			response.write(data);
			response.end(""); //不寫則沒有htpp協議尾
		}
		//optfile.readfile1('./view/01.txt', response);
		//response.end("ok");
		optfile.readfile2('./view/01.txt', recall);
		console.log("===主程式執行完畢===！");
	}
}).listen(8000);
console.log('Server  running  at  http://127.0.0.1:8000/');