puppeteer无头模式下隐藏userAgent特征

以下是无头模式下，可通过navigator.userAgent判断出来

设置初始化浏览器后设置userAgent

await page.setUserAgent('Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.0 Safari/537.36');