The usage method is as follows.
YUI Compressor Online
Just click "Browse", specify the JS file, click "Compress" when accessing the above site. Very easy.
After waiting for a while the link for downloading will be displayed in this way so you can download it if you click it. It seems that it was able to compress about 42% this time.
For reference level, the JS file of 124 KB was compressed to 72 KB.
Optional designation is also possible, and the meaning of each is as follows.
· Minify only, do not obfuscate: Do not obfuscate by compression alone
Preserve all semicolons: Do not delete unnecessary semicolons
• Disable all micro optimizations: Disable all standard optimizations