A simple example of whether the Node.js detection port (port) is occupied _node.js

Objective

In Network technology, ports (port) generally have two meanings: first, the physical port, for example, ADSL Modem, hubs, switches, routers to connect other network devices, such as RJ-45 Port, SC port and so on. The second is the logical port, generally refers to the TCP/IP protocol port, the range of port number from 0 to 65535, such as for browsing Web services. The purpose of this article is to solve the SSR tool when a number of services to the port is occupied, the following to share the study of the Code snippets, there is a need for reference.

Sample code

Detect if port is occupied function probe (port, callback) {var server = Net.createserver (). Listen (port) var calledonce = False var timeoutref = settimeout (function () {Calledonce = True callback (False,port)}, Watts) timeoutref.unre F () var connected = False Server.on (' Listening ', function () {cleartimeout (TIMEOUTREF) if (server) SE Rver.close () if (!calledonce) {calledonce = True callback (True,port)}) Server.on (' Error ', Fu

    Nction (Err) {cleartimeout (timeoutref) var result = True if (Err.code = = ' Eaddrinuse ') result = False  if (!calledonce) {calledonce = True callback (Result,port)}})} function server (_port) {var pt = _port | |
  __port;  Probe (Pt,function (bl,_pt) {//Port occupied BL returns false//_PT: Incoming port number if (bl = = true) {//SSR (_PT) Server =
      Http.createserver (Connlistener);
      Server = Server.listen (parseint (_pt, 10)); Console.log ("\ n Static File serverRunning at "+" \n\n=> http://localhost: "+ _pt + ' \ n '); }else{Server (_PT+1)}})}

Summarize

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