Test compression rate via following tools:
- Closure Compiler (2010/01/04)
- YUI Compressor 2.4.2 (2009/06/10)
- Microsoft Ajax Minifier 1.1 (2009/11/15)
| jQuery 1.3.2 regular | jQuery 1.3.2 minified | |
| Original | 124,995 | 57,254 |
| Closure Compiler (default) | 55,334 | 55,334 |
| Closure Compiler (advanced) | 49,647 | 49,647 |
| YUI Compressor | 57,524 | 56,705 |
| Microsoft Ajax Minifier (default) | 72,346 | 56,061 |
| Microsoft Ajax Minifier (hypercrunching) | 53,573 | 53,570 |
由上表可知，Closure Compiler不管source是否有經過其他方式壓縮，都能做出正確地壓縮，達成最小壓縮；贏家為：Closure Compiler！
Conclusion: Closure Compiler can provide minimized javascript, it's the best choice!
2011 Update: Please take a look at UglifyJS – 更強大的 JS Compressor
Conclusion: Closure Compiler can provide minimized javascript, it's the best choice!
2011 Update: Please take a look at UglifyJS – 更強大的 JS Compressor
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