playwright处理下载对话框

### 使用 Playwright 处理下载对话框

为了处理文件下载，Playwright 提供了一套专门用于管理下载事件的 API。通过监听 `download` 事件可以捕获并处理浏览器中的下载操作[^1]。

下面是一个完整的 Python 脚本示例，展示了如何配置页面以自动触发下载，并获取已保存到本地磁盘上的文件路径：

import asyncio
from playwright.async_api import async_playwright

async def run(playwright):
    browser = await playwright.chromium.launch(headless=False)
    context = await browser.new_context()
    page = await context.new_page()

    # 设置下载路径
    user_data_dir = "/path/to/download/directory"
    await context.set_default_navigation_timeout(60000)

    # 开始跟踪下载事件
    download_path = []
    
    def handle_download(download):
        path = download.path()
        download_path.append(path)
        print(f"Downloaded file saved at {path}")

    context.on("download", handle_download)

    # 导航至目标网页并点击引发下载行为的按钮或链接
    await page.goto('https://example.com')
    await page.click('text=Click here to Download')

    # 等待一段时间确保下载完成
    await asyncio.sleep(5)

    # 打印最终下载位置
    if len(download_path) > 0:
        print(f"The downloaded file is located at: {download_path[-1]}")

    await browser.close()

async def main():
    async with async_playwright() as pw:
        await run(pw)

# 运行异步函数
if __name__ == "__main__":
    asyncio.run(main())

此脚本创建了一个新的浏览器实例，在访问指定 URL 后模拟用户交互来启动文件下载过程。当检测到有新文件被下载时，会调用回调函数记录其存储地址。最后关闭浏览器结束整个流程。