Frame.waitForSelector() 方法

¥Frame.waitForSelector() method

等待与给定选择器匹配的元素出现在框架中。

¥Waits for an element matching the given selector to appear in the frame.

此方法适用于各种导航。

¥This method works across navigations.

签名

¥Signature

class Frame {
  waitForSelector<Selector extends string>(
    selector: Selector,
    options?: WaitForSelectorOptions
  ): Promise<ElementHandle<NodeFor<Selector>> | null>;
}

参数

¥Parameters

范围	类型	描述
selector	选择器	要查询和等待的选择器。
options	WaitForSelectorOptions	（可选的）用于自定义等待行为的选项。

Returns:

Promise<ElementHandle<NodeFor<Selector>> | null>

与给定选择器匹配的元素。

¥An element matching the given selector.

异常

¥Exceptions

如果未出现与给定选择器匹配的元素，则抛出该异常。

¥Throws if an element matching the given selector doesn't appear.

示例

¥Example

import puppeteer from 'puppeteer';

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  let currentURL;
  page
    .mainFrame()
    .waitForSelector('img')
    .then(() => console.log('First URL with image: ' + currentURL));

  for (currentURL of [
    'https://example.com',
    'https://google.com',
    'https://bbc.com',
  ]) {
    await page.goto(currentURL);
  }
  await browser.close();
})();