module.exports = {  expfun: function(flag) {    if(flag == 0) {      throw '我是error';    }    return "success";  }}

//-------------optfile.js-------------------------var fs = require('fs');module.exports = {  readfile: function (path, recall) { //異步執(zhí)行    fs.readFile(path, function (err, data) {      if (err) {        console.log("異步執(zhí)行error：" + err);        recall("文件不存在，異步執(zhí)行error：" + err);//異步處理異常      } else {        //console.log(data.toString());        recall(data);      }    });    console.log("===異步方法執(zhí)行完畢===");  },  readImg: function (path, res) {    fs.readFile(path, 'binary', function (err, filedata) {      if (err) {        console.log(err);        return;      } else {        console.log("輸出文件");        res.write(filedata, 'binary');        res.end();      }    });  }}

var optfile = require('../model/optfile2.js');function getRecall(req, res) {  res.writeHead(200, {    'Content-Type': 'text/html; charset=utf-8'  });  function recall(data) {    res.write(data);    res.end(''); //不寫則沒有http協(xié)議尾  }  return recall;}module.exports = {  login: function (req, res) {    recall = getRecall(req, res);    optfile.readfile('./view/login.html', recall);  },  showimg: function (req, res) {    res.writeHead(200, {      'Content-Type': 'image/jpeg'    });    optfile.readImg("./view/pig.png", res);  }}