node.js轻松搭建一个服务器

前台获取数据时经常遇见跨域问题，以前一直用nginx做反向代理商。最近在用vuejs，发现webpack-dev-server的代理商简单好用。于是仿照写了一个简单的web服务器，用于非webpack的项目。

1 const request = require('request'); 2 const express = require('express'); 3 const path = require('path'); 4  5 const app = express(); 6  7 const proxyTable = { 8   '/wcf': { 9     target: '10   }11 };交流学习圈58273593612 13 app.use(function(req, res,next) {14   const url = req.url;15   if (req.method == 'OPTIONS') {16       console.log('options_url: ', url);17       18       // res.header("Access-Control-Allow-Origin", req.headers.origin || '*');19       // res.header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With");20       // res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");21       22       // res.header("Access-Control-Allow-Credentials", true);23 24       res.status(200).send('OK');25       return;26   } 27 28   // console.log('req_url: ', url);29   next();30 });31 32 交流学习圈58273593633 app.use(express.static(path.join(__dirname, 'static')));34 35 app.use('/', function(req, res) {36   const url = req.url;37   const proxy = Object.keys(proxyTable);38   let not_found = true; 39   for (let index = 0; index < proxy.length; index++) {40     const k = proxy[index];41     const i = url.indexOf(k);42     if (i >= 0) {     43       not_found = false;44       const element = proxyTable[k];45       const newUrl = element.target + url.slice(i+k.length);46       req.pipe(request({url: newUrl, timeout: 60000},(err)=>{47         if(err){48           console.log('error_url: ', err.code,url);49           res.status(500).send('');50         }     51       })).pipe(res);52       break;53     } 54   }55   if(not_found) {56     console.log('not_found_url: ', url);57     res.status(404).send('Not found');58   } else {59     console.log('proxy_url: ', url);60   }61 });62 交流学习圈58273593663 const PORT = 8080;64 app.listen(PORT, () => {65   console.log66 });