YUI Compressor是开源的JavaScript压缩工具，使用java编写。它可以移除js/css文件中的注释和空行/空格，使用尽可能短的字符串混淆变量名。平均可以压缩20%。
YUI Compressor的源代码托管在Github：https://github.com/yui/yuicompressor
其它压缩工具：JSMin（https://github.com/douglascrockford/），Pyjsmin（https://pypi.python.org/pypi/jsmin）
Ubuntu 安装 YUI Compressor
$ sudo apt-get install yui-compressor
使用YUI Compressor
查看帮助：
$ yui-compressor help
Usage: java -jar yuicompressor-x.y.z.jar [options] [input file]
Global Options
-h, --help Displays this information
--type <js|css> Specifies the type of the input file
--charset <charset> Read the input file using <charset>
--line-break <column> Insert a line break after the specified column number
-v, --verbose Display informational messages and warnings
-o <file> Place the output into <file>. Defaults to stdout.
Multiple files can be processed using the following syntax:
java -jar yuicompressor.jar -o '.css$:-min.css' *.css
java -jar yuicompressor.jar -o '.js$:-min.js' *.js
JavaScript Options
--nomunge Minify only, do not obfuscate
--preserve-semi Preserve all semicolons
--disable-optimizations Disable all micro optimizations
If no input file is specified, it defaults to stdin. In this case, the 'type'
option is required. Otherwise, the 'type' option is required only if the input
file extension is neither 'js' nor 'css'.
压缩js：
$ yui-compressor --type js --charset utf-8 -v myjs.js -o myjs-min.js
压缩css：
$ yui-compressor --type css --charset utf-8 -v mycss.css -o mycss-min.css
js脚本压缩（comjs.sh）：
if [ $# -eq 0 ]; then
echo "要压缩的文件." 1>&2
exit 1
fi
for file in "$@";
do
if [ -f "$file" ]; then
yui-compressor -o "${file%%.*}-min.js" "$file"
if (( $? )); then
echo "$file 不嫩压缩" >&2
exit 1
else
echo "$file 压缩为 ${file%%.*}-min.js"
fi
else
echo "找不到 '$file' 文件." >&2
fi
done;
exit 0
使用方法：
$ comjs.sh file.js
$ comjs.sh file1.js file2.js file3.js
css脚本压缩（comcss.sh）：
if [ $# -eq 0 ]; then
echo "要压缩的文件." 1>&2
exit 1
fi
for file in "$@";
do
if [ -f "$file" ]; then
yui-compressor -o "${file%%.*}-min.css" "$file"
if (( $? )); then
echo "$file 不嫩压缩" >&2
exit 1
else
echo "$file 压缩为 ${file%%.*}-min.css"
fi
else
echo "找不到 '$file' 文件 '$file'." >&2
fi
done;
exit 0