本文实例讲述了Nodejs处理异常操作。分享给大家供大家参考，具体如下：

Exception.js

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

optfile.js

//-------------optfile.js-------------------------var fs = require('fs');module.exports = { readfile: function (path, recall) { //异步执行 fs.readFile(path, function (err, data) { if (err) { console.log("异步执行error：" + err); recall("文件不存在，异步执行error：" + err);//异步处理异常 } else { //console.log(data.toString()); recall(data); } }); console.log("===异步方法执行完毕==="); }, readImg: function (path, res) { fs.readFile(path, 'binary', function (err, filedata) { if (err) { console.log(err); return; } else { console.log("输出文件"); res.write(filedata, 'binary'); res.end(); } }); }}

router.js

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(''); //不写则没有http协议尾 } 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); }}

//-------------n9_exception.js---------------var http = require('http');var url = require('url');var router = require('./model/router');var exception = require('./model/Exception');http.createServer(function (request, response) { if (request.url !== "/favicon.ico") { //清除第2此访问 pathname = url.parse(request.url).pathname; pathname = pathname.replace(/\//, ''); //替换掉前面的/ try { router[pathname](request, response); // data = exception.expfun(0); // response.write(data); // response.end(''); } catch (err) { console.log('捕获到异常=' + err); response.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' }); response.write(err.toString()); response.end(''); } console.log("server执行完毕"); }}).listen(8000);console.log('Server running at http://127.0.0.1:8000/');

希望本文所述对大家nodejs程序设计有所帮助。