启用服务
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
const urlencodedParser = bodyParser.urlencoded({ extended: false })
app.use(express.static('public'));
// app.get("/index/:id/:test",(req,res)=>{
//req.query 返回一个对象
//req.parmas 获取路由的参数
//res.json res.jsonp res.redirect res.cookie
//res.download res.render
// console.log(req.query.username)
// res.send('Hello'+ req.params.id);
// res.json({
// id:123
// })
// })
app.get('/index',(req,res,next)=>{
req.data = 123;
console.log(req.data)
next();
},(req,res,next)=>{
res.sendFile(__dirname+"/views/index.html")
})
app.post('/index',urlencodedParser,function(req,res){
const keyword = req.body.username;
res.redirect("http://www.baidu.com/s?wd="+keyword);
})
const server = app.listen(8080,function(){
console.log('接口已启动')
})
//1.安装并引入express，并启用一个express的实例
//2.app.listen 一个端口启动一个后台服务
//3.app.get 设置基础路由 然后吐出数据
//4.平时的请求都是get 浏览器直接敲
//5 get post put delete
//restful
中间件
const express = require('express');
const app = express();
const router = express.Router();
const cookieParser = require('cookie-parser');
router.use(function(req,res,next){
console.log(123456);
next();
})
app.use('/',router)
app.get('/index',(req,res,next)=>{
req.data = 123;
console.log(req.data)
next();
},(req,res,next)=>{
res.send('hello world')
})
//错误级中间价
app.get('/indexs',(req,res,next)=>{
req.data = 123;
console.logsss(1111);
})
app.use(function(err, req, res, next) {
console.error(err.stack);
res.status(500).send('Something broke!');
});
//内置中间价
//第三方中间价
app.use(cookieParser());
app.use(function(req,res,next){
req.cookies = function(){
return {
data:123
}
}
})
app.get('/cookie',(req,res,next)=>{
console.log(req.cookies().data)
})
const server = app.listen(8080,function(){
console.log(
'接口已启动')
})
//应用级中间件 app.use app.method
//router 没有特别复杂app里的api 只有路由相关的api
//错误处理中间件
//内置中间件 app.use(express.static(public))
//
路由
var express = require('express');
var app = express();
var birds = require("./birds");
app.all('/index',function(req,res,next){
console.log(111)
next();
},function(req,res,next){
res.send("hello,word");//页面到这
next();
},function(req,res,next){
console.log('我是结尾')
})
// app.route('/book').get(function(){
// }).post(function(){}).put(function(){
// })
app.use("/birds",birds);
// app.get("/indexs",[cb0,cb1],function(){}) 数组直接直接写按顺序也可以
app.listen(8080,function(){
console.log('服务启动')
})
// about/index
//about 根路由
//res.json res.render res.redirect
var express = require('express');
var router = express.Router();
router.use("*",function(res,req,next){
console.log("我是根路由");
next();
})
router.use("/",function(res,req,next){
console.log("我是birds");
next();
})
router.get("/ss",function(req,res){
console.log("我是birds/ss");
res.send("hello woshi bird/ss")
})
module.exports = router;
错误处理和模板引擎
var express = require('express');
var app = express();
var swig = require('swig')
app.use(express.static('public'));
app.set('view engine', 'html');
app.engine('html', swig.renderFile);
app.get('/index',function(req,res){
res.render('index',{title:"首页"});
})
app.use(logErrors);
app.use(clientErrorHandler);
app.use(errorHandler);
function logErrors(err, req, res, next) {
console.error(err.stack);
next(err);
}
function clientErrorHandler(err, req, res, next) {
if (req.xhr) {
res.status(500).send({ error: 'Something blew up!' });
} else {
next(err);
}
}
function errorHandler(err, req, res, next) {
res.status(500);
res.end(err.stack)
}
app.listen(8080, function () {
})
//错误处理方式
//错误处理放在最后
//错误日志 log4js express-log 404 500 写日志
https://blog.csdn.net/px_blog/article/details/54934605
