1 const express = require('express');
2 const fs = require('fs');
3 const path = require('path');
4 const app = express();
5
6 app.get('/', (req, res, next)=>{
7 try {
8 const data = JSON.parse('{name:');//试验错误
9 res.json(data);
10 }catch (e) {
11 //抛出错误
12 next(e);
13 }
14 });
15
16 app.get('/b', (req, res, next)=>{
17 fs.readFile(path.join(__dirname, 'ccccc.log'), (err, data)=>{
18 if(err){
19 next(err);
20 }
21 });
22 });
23
24 app.get('/a', (req, res, next)=>{
25 res.send('<h1>Hello World!</h1>');
26 });
27
28
29 /*
30 统一的错误处理日志
31 */
32 app.use((err, req, res, next)=>{
33 const error_log = `
34 =====================================
35 错误名: ${err.name}, \n
36 错误信息:${err.message}, \n
37 错误时间:${new Date()}, \n
38 错误堆栈:${err.stack}, \n
39 =====================================
40 `;
41 fs.appendFile(path.join(__dirname, 'error.log'), error_log, (err)=>{
42 res.writeHead(500, {'Content-Type': 'text/html;charset=utf-8'});
43 res.end('500 服务器内部错误!')
44 });
45 });
46
47 app.use((req, res, next)=>{
48 res.writeHead(404, {'Content-Type': 'text/html;charset=utf-8'});
49 res.end('404 您访问的资源不存在!')
50 });
51
52 app.listen(3000, ()=>{
53 console.log('running.....')
54 });
