我试图用puppeteer删除一些数据,但对于某些站点,querySelector返回null,我不知道哪里出了问题。我在stackoverflow中找到了一些关于这个问题的答案,但都没有奏效。下面的代码包含一个不起作用的示例链接。
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://www.macys.com/shop/product/the-north-face-mens-
logo-half-dome-t-shirt?ID=2085687&CategoryID=30423&cm_kws=2085687');
const textContent = await page.evaluate(() => {
return document.querySelector('.price');
});
console.log(textContent);
browser.close();
})();
发布于 2018-06-06 09:06:09
在对页面进行快照后,发现我的请求被机器人检测系统阻塞。以下是解决方案。我们只需要传递更多的数据,这样它就不会被检测为机器人。如果它仍然不能工作,你可以查看this tutorial。
const puppeteer = require('puppeteer');
// This is where we'll put the code to get around the tests.
const preparePageForTests = async (page) => {
// Pass the User-Agent Test.
const userAgent = 'Mozilla/5.0 (X11; Linux x86_64)' +
'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.39 Safari/537.36';
await page.setUserAgent(userAgent);
}
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await preparePageForTests(page);
// await page.setRequestInterception(true);
await page.goto('websiteURL');
const textContent = await page.evaluate(() => {
return {document.querySelector('yourCSSselector').textContent,
}
});
console.log(textContent);
browser.close();
发布于 2018-06-04 16:14:00
这些元素可能是通过javascript异步加载的,并且在调用.evaluate()时仍然不在DOM中。
尝试等待具有木偶剧.waitForSelector函数的选择器
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://www.macys.com/shop/product/the-north-face-mens-
logo-half-dome-t-shirt?ID=2085687&CategoryID=30423&cm_kws=2085687');
await page.waitForSelector('.price');
const textContent = await page.evaluate(() => {
return document.querySelector('.price');
});
console.log(textContent);
browser.close();
})();
https://stackoverflow.com/questions/50663992
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