playwright使用

Playwright是一种用于编写Web自动化测试和爬虫的开源工具。它支持多种浏览器（Chrome，Edge，Firefox和Safari）和多种编程语言（JavaScript，TypeScript，Python和Java）。以下是一些使用Playwright的示例：

1.安装Playwright：

npm install playwright

2.启动浏览器（例如Chrome）：

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('https://www.baidu.com');
  await browser.close();
})();```

3.执行搜索操作：

```const { chromium } = require('playwright');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('https://www.baidu.com');
  await page.type('input[name="wd"]', 'playwright');
  await page.click('input[type="submit"]');
  await browser.close();
})();```

4.使用断言验证搜索结果：

```const { chromium } = require('playwright');
const assert = require('assert');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('https://www.baidu.com');
  await page.type('input[name="wd"]', 'playwright');
  await page.click('input[type="submit"]');
  const searchResult = await page.$eval('.result-op', el => el.textContent);
  assert(searchResult.includes('Playwright - GitHub'), 'Search result not found');
  await browser.close();
})();```

5.使用Playwright编写爬虫：

```const { chromium } = require('playwright');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('https://www.example.com');
  const links = await page.$$eval('a', els => els.map(el => el.href));
  console.log(links);
  await browser.close();
})();```

这些示例只是Playwright的一小部分功能。Playwright还支持截图，PDF生成，录制，模拟设备，网络拦截和更多功能。