在 puppeteer 的 headless true 模式下找不到选择器的节点

Question

我的环境：

人偶版本：1.20.0
平台/OS 版本：Ubuntu 18.04.3 LTS
Node.js版本：8.10.0
Chrome/78.0.3882.0

此错误内容打印在终端：

(node:18157) UnhandledPromiseRejectionWarning: Error: No node found for selector: #identifierNext
    at assert (/home/hoangdd3/node_modules/puppeteer/lib/helper.js:279:11)
    at DOMWorld.click (/home/hoangdd3/node_modules/puppeteer/lib/DOMWorld.js:366:5)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
  -- ASYNC --
    at Frame.<anonymous> (/home/hoangdd3/node_modules/puppeteer/lib/helper.js:111:15)
    at Page.click (/home/hoangdd3/node_modules/puppeteer/lib/Page.js:1037:29)
    at puppeteer.launch.then (/home/hoangdd3/pupperteer/example.js:15:16)
    at <anonymous>
    at process._tickCallback (internal/process/next_tick.js:188:7)
(node:18157) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:18157) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

这是我的代码：

const puppeteer = require('puppeteer');

puppeteer.launch({
    headless: true
}).then(async browser => {
    const page = await browser.newPage();
    await page.setViewport({width: 1920, height: 1080});
    await page.goto('https://accounts.google.com/signin/v2/identifier?flowName=GlifWebSignIn&flowEntry=ServiceLogin',  {"waitUntil" : "networkidle0"});

    await page.waitFor(2000);

    await page.click('input[type=email]');
    await page.keyboard.sendCharacter('phamvancuong4584sg@gmail.com');
    await page.click('#identifierNext');

    await page.waitFor(2000);

    await page.evaluate(() => document.querySelector('#password > div > div > div > input').click());
    await page.keyboard.sendCharacter('test');
    await page.evaluate(() => document.querySelector('#passwordNext').click());

    await page.screenshot({path: 'example.png'});

    await browser.close();
});

Answer 1

看起来 await page.click('#identifierNext'); 中没有 id=identifierNext

的元素

代替 await page.click('#identifierNext');

尝试使用

const next = await page.waitForSelector('#identifierNext');
await next.click();

不同 click('#identifierNext') waitForSelector and click

waitForSelector - 可以等待元素 30,000 秒以将元素添加到 DOM

click - 如果现在 DOM 中没有元素，click 将拒绝 Promise

Answer 2

您面临的问题与选择器有关，它们根本不存在 :)。 html 在 headless: true 中提供的服务与在 headless: false

中提供的服务不同

您的代码段在 headless: false

上使用时可以正常工作

有代码可以在 headless: true

中使用

const puppeteer = require('puppeteer');

(async () => {
    const browser = await puppeteer.launch({
        headless: true,
    });
    const page = await browser.newPage();

    await page.goto('https://accounts.google.com/signin/v2/identifier?flowName=GlifWebSignIn&flowEntry=ServiceLogin',  {"waitUntil" : "networkidle0"});
    await page.waitFor(2000);

    await page.click('#Email');
    await page.keyboard.sendCharacter('phamvancuong4584sg@gmail.com');

    await page.click('#next');

    await page.waitFor(2000);

    await page.click('#Passwd');

    await page.keyboard.sendCharacter('test');
    await page.click('#signIn');

    await page.screenshot({path: 'example.png'});

    await browser.close();
})();

在屏幕上 example.png 您可以看到密码不正确的信息（测试）。

在 puppeteer 的 headless true 模式下找不到选择器的节点

No node found for selector in headless true mode of puppeteer

javascript

node.js

headless-browser

google-chrome-headless

puppeteer