个人初步试用了下感觉yui compressor压缩率最好
jsmin:
http://www.hetaoblog.com/%E7%BD%91%E7%AB%99%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96%E5%B7%A5%E5%85%B7-javascript%E5%8E%8B%E7%BC%A9%E5%B7%A5%E5%85%B7jsmin/

yui compressor:
http://www.hetaoblog.com/javascript-compressor-yui-compressor/

dojo compressor:
http://www.hetaoblog.com/javascript-compressor-dojo-compressor/
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