javascript - Node.js 的 http.Server 和 http.createServer，有什么区别？

Question

有什么区别:

http.Server(function(req,res) {});

和

http.createServer(function(req, res) {});

Answer 1

基于nodejs的源码(摘录如下)，createServer只是实例化Server的辅助方法。

摘自 line 1674 of http.js .

exports.Server = Server;


exports.createServer = function(requestListener) {
  return new Server(requestListener);
};

因此，您在原始问题中提到的两个代码片段的唯一true 区别在于您没有使用 new 关键字。

---

为了清楚起见，Server 构造函数如下(2012-12-13 后):

function Server(requestListener) {
  if (!(this instanceof Server)) return new Server(requestListener);
  net.Server.call(this, { allowHalfOpen: true });

  if (requestListener) {
    this.addListener('request', requestListener);
  }

  // Similar option to this. Too lazy to write my own docs.
  // http://www.squid-cache.org/Doc/config/half_closed_clients/
  // http://wiki.squid-cache.org/SquidFaq/InnerWorkings#What_is_a_half-closed_filedescriptor.3F
  this.httpAllowHalfOpen = false;

  this.addListener('connection', connectionListener);

  this.addListener('clientError', function(err, conn) {
    conn.destroy(err);
  });
}
util.inherits(Server, net.Server);