I haven't tried it out myself, but I suspect that something like mod_gzip is the best solution if you are using Apache.

If you are not, then you could write a decompression algorithm in JavaScript and then convert your JavaScript into a file that looks like this: 

eval(uncompress('#$!@compressed gobbledygook
here@#$@#'))

[download]

In reply to Re (tilly) 1: Compressing/Obfuscating a Javascript file by tilly
in thread Compressing/Obfuscating a Javascript file by Incognito

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