nodejs获取POST参数

var http = require('http'),
	url = require('url'),
	querystring = require('querystring');
http.createServer(function(req, res){
	var postData = "";
	req.setEncoding('utf-8');//设置编码
	
	req.addListener('data', function(postDataStream){
		postData += postDataStream
	});
	
	req.addListener('end', function(){
		//数据接收完毕
			var param = querystring.parse(postData);
			console.log(param);
		
	});
	res.writeHead(200, {'Content-Type':"text/plain"});
	res.end('success');
}).listen('3000');
//请求curl -d "a=2&b=3" http://localhost:3000
//console.log(param);//{ a: '2', b: '3' }