无法读取未定义 - 节点的属性'parent'.js

Question

我试图使用超级代理和cheerio从kijiji抓取数据进行学习，同时我收到错误"无法读取未定义的属性'父'"。（我尝试了craigslist，这很好）。它发生在我得到正确的结果"对象"之后。啦似乎有些不对劲。有人对此有任何想法吗？提前感谢您的帮助。

[ERROR] 17:30:24 TypeError
TypeError: Cannot read property 'parent' of undefined
    at Function.exports.update (C:Userszhi_xienodejsneomovienode_modulesch
eeriolibparse.js:55:25)
    at module.exports (C:Userszhi_xienodejsneomovienode_modulescheeriolib
parse.js:17:11)
    at Function.exports.load (C:Userszhi_xienodejsneomovienode_moduleschee
riolibstatic.js:19:14)
    at C:Userszhi_xienodejsneomovieroutescrawlerusers.js:35:27
    at Request.callback (C:Userszhi_xienodejsneomovienode_modulessuperagen
tlibnodeindex.js:746:30)
    at Request.<anonymous> (C:Userszhi_xienodejsneomovienode_modulessupera
gentlibnodeindex.js:135:10)
    at Request.emit (events.js:95:17)
    at ClientRequest.<anonymous> (C:Userszhi_xienodejsneomovienode_modules
superagentlibnodeindex.js:921:12)
    at ClientRequest.emit (events.js:95:17)
    at HTTPParser.parserOnIncomingClient [as onIncoming] (http.js:1692:21)

以下是代码：

  var superagent = require('superagent');
  var cheerio = require('cheerio');
  var url = require('url');
  var kijijiUrl = 'http://www.kijiji.ca/b-immobilier/ville-de-montreal/c34l1700281?ad=wanted';
  superagent.get(kijijiUrl).end(function (err, res) {
    if (err) {
      return console.error(err);
    }
    var topicUrls = [];
    var $ = cheerio.load(res.text);
    // get all links in that page
    $('div.container-results').children('table').each(function (idx, element) {
      var $element = $(element);
      var href = url.resolve(kijijiUrl, $element.attr('data-vip-url'));
      topicUrls.push(href);
    });
    for(i = 0; i<topicUrls.length; i++){
      superagent.get(topicUrls[i])
        .end(function (err, sres) {
          //normal err handler
          if (err) {
            return next(err);
          }
          var $ = cheerio.load(sres.text);
          var object = {};
          $('table.ad-attributes').find('tr').not('.divider').each(function(i, element){
            var titles = $(element).children('th').text().trim();
            var values = $(element).children('td').text().trim();          
            object[titles] = values;
          });
          console.log(object);               
      });        
    }
  })  

Answer 1

正如 chrki 已经说过的，cheerio.load() 是用空值（如 null 或空字符串）调用的。在调用 .load() 之前检查该值是否包含某些内容：

if (res.text) {
    var $ = cheerio.load(res.text);
} else {
    // do something else
}

Answer 2

我有相同的错误消息

$ = cheerio.load(response.Body);

应该是

$ = cheerio.load(response.body);

所以Cheerio没有什么可以加载的。