copied a crawler from the website to crawl some product information, but I don"t know why the single page of the product just can"t climb down.
but tested that all other pages are crawable. Why?
found the next returned error information, which seems to have nothing to do with the crawler.

return error

events.js:183
      throw er; // Unhandled "error" event
      ^

Error: read ECONNRESET
    at _errnoException (util.js:1022:11)
    at TLSWrap.onread (net.js:628:25)

attach code:

var cheerio = require("cheerio");
var http = require("https");
var iconv = require("iconv-lite");

var index = 1;
var n = 0;
var url = "https://www.thermofisher.com/search/browse/category/cn/zh/602198?navId=10861&resultPage=";
var titles = [];
var datas = [];

//href
function getTitle(url, i) {
    console.log("now get " + i + " page");
    http.get(url + i + "&resultsPerPage=15", function(sres) {
        var chunks = [];
        sres.on("data", function(chunk) {
            chunks.push(chunk);
        });
        sres.on("end", function() {
            var html = iconv.decode(Buffer.concat(chunks), "UTF-8");
            var $ = cheerio.load(html, { decodeEntities: false });
            $("h2>a").each(function(idx, element) {
                var $element = $(element);
                titles.push({
                    title: $element.attr("href")
                });
            });
            if (i < 5) {
                getTitle(url, PPindex);
            } else {
                console.log(titles);
                console.log("over");
                getData(titles, n);
            }
        })
    })
}

//
function getData(urls, n) {
    console.log("now get " + n + " data");
    var link = urls[n].title.toString();
    console.log(link);
    http.get(link, function(sres) {    //link
        var chunks = [];
        sres.on("data", function(chunk) {
            chunks.push(chunk);
        })
        sres.on("end", function() {
            var html = iconv.decode(Buffer.concat(chunks), "UTF-8");
            var $ = cheerio.load(html, { decodeEntities: false });
            $(".container h1").each(function(idx, element) {
                var $element = $(element);
                console.log($element);
                datas.push({
                    name: $element.text()
                });
            });
            if (n < urls.length - 1) {
                getData(titles, PPn);
            } else {
                console.log("ok");
                console.log(datas);
            }
        })
    })
}


function main() {
    console.log("start");
    getTitle(url, index);
}

main();