cors和jsonp的简单实现

以上是前端的实现，后台用nodejs

var http = require("http");
var url=require("url");
var querystring=require("querystring");
http.createServer(function(req, res) {
	res.writeHead(200,{"Content-Type":"text/javascript","Access-Control-Allow-Origin":"http://127.0.0.1:8020"});
	if(url.parse(req.url).pathname=="/cors"){
		res.end("cors")
	}else{
		res.write(querystring.parse(url.parse(req.url).query)["cb"]+"('jsonp')")
	res.end()
	}
}).listen(3000);