搜索await page.waitForSelector(allResultsSelector);

/**

 * Copyright 2017 Google Inc. All rights reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/**

 * @fileoverview Search developers.google.com/web for articles tagged

 * "Headless Chrome" and scrape results from the results page.

 */

'use strict';

const puppeteer = require('puppeteer');

(async() => {

  const browser = await puppeteer.launch();

  const page = await browser.newPage();

  await page.goto('https://developers.google.com/web/');



  // Type into search box.---输入文字 还有提换方法
  //await page.focus('#kw');
  //await page.keyboard.sendCharacter('狗');

  await page.type('#searchbox input', 'Headless Chrome');

  // Wait for suggest overlay to appear and click "show all results".

  const allResultsSelector = '.devsite-suggest-all-results';
//等待元素加载

  await page.waitForSelector(allResultsSelector);

  await page.click(allResultsSelector);

  // Wait for the results page to load and display the results.

  const resultsSelector = '.gsc-results .gsc-thumbnail-inside a.gs-title';

  await page.waitForSelector(resultsSelector);

  // Extract the results from the page.

  const links = await page.evaluate(resultsSelector => {

    const anchors = Array.from(document.querySelectorAll(resultsSelector));

    return anchors.map(anchor => {

      const title = anchor.textContent.split('|')[0].trim();

      return `${title} - ${anchor.href}`;

    });

  }, resultsSelector);

  console.log(links.join('\n'));

  await browser.close();

})();
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搜索await page.waitForSelector(allResultsSelector);

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