express快速入门

//express入门

var express = require('express');
var app = express();
var bodyParser = require("body-parser");
app.use(bodyParser.urlencoded({ extended: false }));

　//app.use('/', express.static(path.join(__dirname, 'public')));

app.all('*',function(req,res,next){
    res.header('Access-Control-Allow-Origin','*');
    if(req.method=='OPTIONS') res.send(200);
    else next();
})
app.get('/demo',function(req,res){
    res.send({
        a:1,
        b:2
    })
})

var interfaces = require('os').networkInterfaces();


var host = '';  
for(var devName in interfaces){  
      var iface = interfaces[devName];  
      for(var i=0;i<iface.length;i++){  
           var alias = iface[i];  
           if(alias.family === 'IPv4' && alias.address !== '127.0.0.1' && !alias.internal){  
            host = alias.address;  
           }  
      }  
}  
var server = newFunction();
function newFunction() {
    return app.listen(3000, function () {
        // var host = net.en0[1].address||'';
        // var host2 = net.lo0[0].address || ''
        // var port = server.address().port;
        var port = 3000;
        console.log("应用实例，访问地址为 http://%s:%s",host,port);
        // console.log("应用实例，也可以访问地址为 http://%s:%s", host2, port);
    });
}

 express-router 的使用

const express = require('express');
const path = require('path');
const favicon = require('serve-favicon');
const routes = require('./routes/index');
const app = express();

const bodyParser = require('body-parser');//post请求查看参数需要
app.use(bodyParser.json());//返回仅解析json
app.use(bodyParser.urlencoded({extended: false}));//UTF-8编码

app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));


app.use(express.static(path.join(__dirname,'public')));//访问静态资源,单文件

 //多文件

 const crl = require('./controller/index');

 

app.all('*',function(req,res,next){
    res.header('Access-Control-Allow-Origin','*');
    if(req.method=='OPTIONS') res.send(200);
    else next();
})

routes(app);

  crl(app);

app.listen(8808,function(){
    console.log('88080000');
});

index.js

module.exports=function(app){
    app.use('/',require('./login'));
};

login.js

const express = require('express');
const router = express.Router();

router.get('/loginout', function (req, res) {
    //res.clearCookie('zxdc');
    res.json({code:200,msg: '退出成功'});
});

module.exports = router;

contrller/index.js

module.exports=function(app){
    app.use('/',require('./test'));
}

contrller/test.js　　

const express = require('express');
const crl = express();
const fs = require('fs');
var path = require('path');

//方法一
crl.use('/', express.static(path.join(__dirname, '/../public')));
crl.use('/demo', express.static(path.join(__dirname, '/../public', 'index2.html')));

//方法二
crl.get("/helloworld.html", function (request, response) {
	console.log(request.path)
	//fs.readFile("../public/" + request.path.substr(1), function (err, data) {
	// fs.readFile(path.join(__dirname, '/../public','helloworld.html'), function (err, data) {
	 fs.readFile(__dirname+'/../public' + request.path, function (err, data) {
	// body
	if (err) {
		console.log(err);
		//404：NOT FOUND
		response.writeHead(404, {
			"Content-Type": "text/html"
		});
	} else {
		//200：OK
		response.writeHead(200, {
			"Content-Type": "text/html"
		});
		response.write(data.toString());
	}
	response.end();
});

module.exports = crl;

　　

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