简单搭建express服务器

var express = require('express');

var app = express();

//允许访问,解决跨域

app.all('*', function (req, res, next) {

    res.header('Access-Control-Allow-Origin', req.headers.origin || '*');

    res.header('Access-Control-Allow-Headers',

    'Content-Type,Content-Length,Authorization,\'Origin\',Accept,X-Requested-With');

    res.header('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    res.header('Access-Control-Allow-Credentials', true);

    res.header('X-Powered-By', ' 3.2.1');

    res.header('Content-Type', 'application/json;charset=utf-8');

next();

})

//接口

app.post('/signin',function(req,res){

res.send('输出需要返回的内容')

})

var server = app.listen(3000, function () {

var host = server.address().address

var port = server.address().port

console.log("应用实例，访问地址为 http://%s:%s", host, port)

})