In the video site such as Youku, Tudou, etc. to find a favorite square dance, click on the video playback page at the bottom of a download button, as long as you install the corresponding site to download the plug-ins can be downloaded. It's just that it's a bit of a pain in the ass to install different plug-ins for different video sites.
Now you just need to install a download tool called Weitang, which is available on all video sites, and after installing it, right-click on the playback page and select "Use Weitang to download", which is very convenient.