UniAPP实现APP端截取页面生成Base64图片，并将Base64图片保存到相册

uni-app 中使用 html2canvas 生成图片（支持多端）

https://blog.csdn.net/weixin_42779803/article/details/118384426

uniapp 实现base64格式图片保存到相册

https://www.cnblogs.com/Alioo/p/13985412.html#:~:text=uni-app%E5%B0%86%E5%9B%BE%E7%89%87%E5%AD%98%E5%85%A5%E7%B3%BB%E7%BB%9F%E7%9A%84%E5%AE%98%E6%96%B9api%E6%98%AF%20uni.saveImageToPhotosAlbum,%28OBJECT%29%20%EF%BC%8C%E9%9C%80%E8%A6%81%E7%BB%99%E5%AE%9A%E4%B8%80%E4%B8%AA%E6%96%87%E4%BB%B6%E8%B7%AF%E5%BE%84filePath%EF%BC%8C%E4%BD%86%E6%98%AF%E8%BF%99%E4%B8%AA%E8%B7%AF%E5%BE%84%E6%88%91%E4%BB%AC%E6%98%AF%E6%B2%A1%E5%8A%9E%E6%B3%95%E6%8B%BF%E5%88%B0%E7%9A%84%E3%80%82%20%E8%A7%A3%E5%86%B3%E6%80%9D%E8%B7%AF%EF%BC%9A%E9%9C%80%E8%A6%81%E7%94%A8%E5%88%B0Bitmap%EF%BC%8C%E6%8A%8Abase64%E8%BD%AC%E6%88%90bitmap%E6%96%87%E4%BB%B6%E5%AF%B9%E8%B1%A1%EF%BC%8C%E4%BF%9D%E5%AD%98%E5%88%B0%E7%B3%BB%E7%BB%9F%E7%9B%B8%E5%86%8C%EF%BC%88%E4%BD%86%E6%98%AF%E6%AD%A4%E6%97%B6%E6%9F%90%E4%BA%9B%E6%89%8B%E6%9C%BA%E4%B8%8A%E6%97%A0%E6%B3%95%E6%98%BE%E7%A4%BA%E5%87%BA%E6%9D%A5%EF%BC%8C%E5%85%B6%E5%AE%9E%E6%98%AF%E4%BF%9D%E5%AD%98%E6%88%90%E5%8A%9F%E7%9A%84%EF%BC%89%EF%BC%8C%E7%84%B6%E5%90%8E%E4%BD%BF%E7%94%A8uni.saveImageToPhotoAlbum%E6%96%B9%E6%B3%95%E5%B0%86%E5%9B%BE%E7%89%87%E6%88%90%E5%8A%9F%E4%BF%9D%E5%AD%98%E5%B9%B6%E6%98%BE%E7%A4%BA%E3%80%82