express获取参数

     bodyParser = require('body-parser');
    //接收post
    app.use(bodyParser.urlencoded({extended: false}));
    app.use(bodyParser.json());
app.post("/get_new_message", function(req,res){//获取新消息
	res.writeHead(200, {'Content-type': 'text/plain'});
	console.log(req.param('uid'), req.param);
});
//express获取参数原型
function (name, defaultValue){
  var params = this.params || {};
  var body = this.body || {};
  var query = this.query || {};
  if (null != params[name] && params.hasOwnProperty(name)) return params[name];
  if (null != body[name]) return body[name];
  if (null != query[name]) return query[name];
  return defaultValue;