如何使用node.js抓取包含动态内容的页面？

I am trying to scrape a website but I don't get some of the elements, because these elements are dynamically created.

我试图刮一个网站，但我没有得到一些元素，因为这些元素是动态创建的。

I use the cheerio in node.js and My code is below.

我在node.js中使用cheerio，我的代码在下面。

var request = require('request');
var cheerio = require('cheerio');
var url = "http://www.bdtong.co.kr/index.php?c_category=C02";

request(url, function (err, res, html) {
    var $ = cheerio.load(html);
    $('.listMain > li').each(function () {
        console.log($(this).find('a').attr('href'));
    });
});

This code returns empty response, because when the page is loaded, the <ul id="store_list" class="listMain"> is empty.

此代码返回空响应，因为在加载页面时，

The content has not been appended yet.

内容尚未附加。

How can I get these elements using node.js? How can I scrape pages with dynamic content?

如何使用node.js获取这些元素？如何用动态内容抓取页面？

3 个解决方案

#1

Here you go;

干得好;

var phantom = require('phantom');

phantom.create(function (ph) {
  ph.createPage(function (page) {
    var url = "http://www.bdtong.co.kr/index.php?c_category=C02";
    page.open(url, function() {
      page.includeJs("http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js", function() {
        page.evaluate(function() {
          $('.listMain > li').each(function () {
            console.log($(this).find('a').attr('href'));
          });
        }, function(){
          ph.exit()
        });
      });
    });
  });
});

#2

Use the new npm module x-ray, with a pluggable web driver x-ray-phantom.

使用新的npm模块X射线，带有可插拔的网络驱动程序x-ray-phantom。

Examples in the pages above, but here's how to do dynamic scraping:

上面几页中的示例，但这里是如何进行动态抓取：

var phantom = require('x-ray-phantom');
var Xray = require('x-ray');

var x = Xray()
  .driver(phantom());

x('http://google.com', 'title')(function(err, str) {
  if (err) return done(err);
  assert.equal('Google', str);
  done();
})

#3

Check out GoogleChrome/puppeteer

查看GoogleChrome / puppeteer

Headless Chrome Node API

无头Chrome节点API

It makes scraping pretty trivial. The following example will scrape the headline over at npmjs.com (assuming .npm-expansions remains)

它使得刮擦非常简单。以下示例将在npmjs.com上删除标题（假设.npm-expansions仍然存在）

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();

  await page.goto('https://www.npmjs.com/');

  const textContent = await page.evaluate(() => {
    return document.querySelector('.npm-expansions').textContent
  });

  console.log(textContent); /* No Problem Mate */

  browser.close();
})();

evaluate will allow for the inspection of the dynamic element as this will run scripts on the page.

evaluate将允许检查动态元素，因为这将在页面上运行脚本。

#1