Production version - used in the actual website, has been streamlined and compressed.
Development version - for testing and development (uncompressed, readable code)
2575 days ago1661 
稻草人2017-12-11 09:41:40
The actual project must use the release version they released. As for the version, the one I use is still relatively old. The version a few years ago, like some projects, is still using 1.4, because some projects do not use some. It doesn't matter if you upgrade JQ's advanced functions or not, but the versions currently used are basically only 1.7 or 1.8, and the latest version is not used. Depending on the needs of the specific project, it does not necessarily have to be the latest, only the most suitable. of