（节点）警告：检测到可能的EventEmitter内存泄漏

我写了一个基于cheerio.js和request.js构build的小脚本，用于从订阅代理站点获取联系信息（URL和电子邮件）。 虽然它运行并返回我需要的所有信息，但在运行时，我连续5次收到以下警告：

(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit. Trace at Socket.EventEmitter.addListener (events.js:160:15) at Socket.Readable.on (_stream_readable.js:689:33) at Socket.EventEmitter.once (events.js:179:8) at Request.onResponse (/home/max/Desktop/scraping/node_modules/request/request.js:625:25) at ClientRequest.g (events.js:175:14) at ClientRequest.EventEmitter.emit (events.js:95:17) at HTTPParser.parserOnIncomingClient [as onIncoming] (http.js:1689:21) at HTTPParser.parserOnHeadersComplete [as onHeadersComplete] (http.js:120:23) at Socket.socketOnData [as ondata] (http.js:1584:20) at TCP.onread (net.js:525:27) 

我的本能告诉我，我可能会得到这个警告，因为我嵌套在另一个请求的请求。 虽然我不确定，但我所知道的是当位于getArtistInfo()函数的cheerio.js .each()循环之一中的嵌套请求被调用时，警告显示正确。 （看看下面的代码，看看我的意思）

这是我的刮刀的代码：

 var request = require('request'); var cheerio = require('cheerio'); var url = 'http://www.primarytalent.com/'; var getManyArtistsInfo = function(url){ request(url, (function(){ return function(err, resp, body) { if(err) throw err; $ = cheerio.load(body); // TODO: scraping goes here $('#rosterlists div li a').each(function(){ var urlCap = this[0]['attribs']['href'].slice(1); var artistURL = url.concat(urlCap); console.log(artistURL); getArtistInfo(artistURL); }); } })()); } var getArtistInfo = function(artistURL){ request(artistURL, (function(){ return function(err, resp, body) { if(err) throw err; $ = cheerio.load(body); console.log("NOW SCRAPING artist's PAGE") var artistName = ""; $('#content #col3-1 h1').each(function(){ artistName = this.text(); console.log(artistName); }); $('#content #col3-1 #links li a').each(function(){ var socialURL = this.attr('href'); var siteURL = ""; var facebookURL = ""; var twitterURL = ""; var soundcloudURL = ""; var bandcampURL = ""; var myspaceURL = ""; switch(socialURL) { case socialURL.indexOf("facebook"): facebookURL = socialURL; console.log(facebookURL); break; case socialURL.indexOf("twitter"): twitterURL = socialURL; console.log(twitterURL); break; case socialURL.indexOf("soundcloud"): soundcloudURL = socialURL; console.log(soundcloudURL); break; case socialURL.indexOf("bandcamp"): bandcampURL = socialURL; console.log(bandcampURL); break; case socialURL.indexOf("myspace"): myspaceURL = socialURL; console.log(myspaceURL); break; default: siteURL = socialURL; console.log(siteURL) } }); // get agentURL $('#content #col3-1 .contacts li a').each(function(){ var agentURL = url + this.attr('href').slice(1); console.log("Agent url is : " + agentURL); request(agentURL, artistName, (function(){ return function(err, resp, body) { if(err) throw err; $ = cheerio.load(body); console.log("NOW SCRAPING AGENT'S PAGE") var agentName = $('#content #col3-1 #details li h1').text(); console.log(agentName + ' reps ' + artistName); var agentEmail = $('#content #col3-1 #details li a').attr("href").slice(7); console.log(agentEmail); var agentPhone = $('#content #col3-1 #details li').last().text(); console.log(agentPhone); var agentArtistList = []; $('#content #col3-1 #artists li a').each(function(){ agentArtistList.push(this.text()); }); console.log(agentName + ' represents ' + agentArtistList.length + ' artists!'); } })(agentURL, artistName)); }); } })(artistURL)); } getManyArtistsInfo(url); 

我在这里做意大利面条吗？

我怎样才能阻止这个EventEmitter内存泄漏问题的发生？

Answer 1

没有理由要求使用IIFE。 我不知道是否可能导致这个错误：

  request(artistURL, function(err, resp, body) { if(err) throw err; $ = cheerio.load(body);