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的源代码(下面的摘录),createServer只是一个实例化a的辅助方法Server.

从http.js的第1674行中提取.

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段中唯一真正的区别在于您没有使用new关键字.

为清楚起见,Server构造函数如下(在2012-12-13之后):

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);