1.pdf-viewer
http://gitlab.lvya.org/frontend/pdf-viewer
demo：
http://eos.lvya.org/static/pdf/m-viewer/viewer.html?url=https://sy-oss.lvya.org/28/2022-06-24/upload_cheykvf4g9q7ktj6lxbt8ze4mxfjbukv.pdf&&title=%E6%B5%8B%E8%AF%95pdf322
