使用 Puppeteer 下载文件时 Chrome 下载错误

Question

我有一个显示页面的应用程序，用户单击一个按钮，然后下载一个 CSV 文件。我想用 Puppeteer 运行它。

问题是 CSV 下载为空且有错误。headless真假都会发生这种情况。页面加载完成，我增加了超时时间，但它仍然失败。可能是什么问题？

const puppeteer = require('puppeteer');

(async () => {
    
    const browser = await puppeteer.launch({
       headless: false
    });

    const page = await browser.newPage();
    await page.goto('http://localhost:4400/login', { waitUntil: 'networkidle2' });    
    
    await page._client.send('Page.setDownloadBehavior', {
        behavior: 'allow',
        downloadPath: './',
    });

    await page.waitForSelector('#run-and-export');
    await page.click('#run-and-export');
  
    // file-downloaded is turned on when the file finished downloading (not to close the window)
    await page.waitForSelector('#file-downloaded', { timeout: 120000 }); 

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

应用程序中生成要下载的文件的代码是一个 Angular 服务：

@Injectable({ 
    providedIn: 'root' 
})
export class DownloadService {

    downloadFile(content:any, fileName: string, mimeType: string){
    
        var blob = new Blob([(content)], {type: mimeType});
        var a = document.createElement('a');
        a.href = window.URL.createObjectURL(blob);
        a.download = fileName;
        a.click();

    }
}

Answer 1

这就是使这项工作的原因：

const downloadPath = path.resolve('/my/path');

await page._client.send('Page.setDownloadBehavior', {
    behavior: 'allow',
    downloadPath: downloadPath 
});