YUI Compressor 2.42 js css压缩
这里分享了淘宝封装的界面版本，方便使用。
压缩css和js是知识兔工作中经常要处理的一件事,这里介绍的是一款基于YUICompressor,淘宝封装的css和js压缩工具TBCompressor.
TBCompressor的安装很简单,知识兔点击install.cmd就可以了,安装后会在里的右键菜单里出现”Compress CSS or JS”选项,需要压缩文件时只需选取目标文件然后知识兔右键点选”Compress CSS or JS”即刻.压缩后的文件会自动重命名.
知识兔这款js压缩工具，是最好用的，jquery等也用这个压缩，压缩率高，不会出现在线压缩工具那样的，各种各样的错误。
好处就是：减少js的体积，减少调用时间，提高网页执行效率，如果知识兔js过大就会导致加载慢，而导致页面的一些效果不能正常快速的执行。
注意：知识兔这款软件需要jdk支持，就是需要安装jdk环境。
可以去官方下载 选择Java SE Development Kit (JDK) JDK 6 Update **
Documentation
==============================================================================
YUI Compressor
==============================================================================
NAME
YUI Compressor – The Yahoo! JavaScript and CSS Compressor
SYNOPSIS
Usage: java -jar yuicompressor-x.y.z.jar [options] [input file]
Global Options
-h, –help Displays this information
–type
–charset
–line-break
-v, –verbose Display informational messages and warnings
-o
JavaScript Options
–nomunge Minify only, do not obfuscate
–preserve-semi Preserve all semicolons
–disable-optimizations Disable all micro optimizations
DESCRIPTION
The YUI Compressor is a JavaScript compressor which, in addition to removing
comments and white-spaces, obfuscates local variables using the smallest
possible variable name. This obfuscation is safe, even when using constructs
such as ‘eval’ or ‘with’ (although the compression is not optimal is those
cases) Compared to jsmin, the average savings is around 20%.
The YUI Compressor is also able to safely compress CSS files. The decision
on which compressor is being used is made on the file extension (js or css)
GLOBAL OPTIONS
-h, –help
Prints help on how to use the YUI Compressor
–line-break
Some source control tools don’t like files containing lines longer than,
say 8000 characters. The linebreak option is used in that case to split
long lines after a specific column. It can also be used to make the code
more readable, easier to debug (especially with the MS Script Debugger)
Specify 0 to get a line break after each semi-colon in JavaScript, and
after each rule in CSS.
–type js|css
The type of compressor (JavaScript or CSS) is chosen based on the
extension of the input file name (.js or .css) This option is required
if no input file has been specified. Otherwise, this option is only
required if the input file extension is neither ‘js’ nor ‘css’.
–charset character-set
If a supported character set is specified, the YUI Compressor will use it
to read the input file. Otherwise, it will assume that the platform’s
default character set is being used. The output file is encoded using
the same character set.
-o outfile
Place output in file outfile. If not specified, the YUI Compressor will
default to the standard output, which you can redirect to a file.
-v, –verbose
Display informational messages and warnings.
JAVASCRIPT ONLY OPTIONS
–nomunge
Minify only. Do not obfuscate local symbols.
–preserve-semi
Preserve unnecessary semicolons (such as right before a ‘}’) This option
is useful when compressed code has to be run through JSLint (which is the
case of YUI for example)
–disable-optimizations
Disable all the built-in micro optimizations.
NOTES
+ If no input file is specified, it defaults to stdin.
+ The YUI Compressor requires Java version >= 1.4.
+ It is possible to prevent a local variable, nested function or function
argument from being obfuscated by using “hints”. A hint is a string that
is located at the very beginning of a function body like so:
function fn (arg1, arg2, arg3) {
“arg2:nomunge, localVar:nomunge, nestedFn:nomunge”;
…
var localVar;
…
function nestedFn () {
….
}
…
}
The hint itself disappears from the compressed file.
+ C-style comments starting with /*! are preserved. This is useful with
comments containing copyright/license information. For example:
/*!
* TERMS OF USE – EASING EQUATIONS
* Open source under the BSD License.
* Copyright 2001 Robert Penner All rights reserved.
*/
becomes:
/*
* TERMS OF USE – EASING EQUATIONS
* Open source under the BSD License.
* Copyright 2001 Robert Penner All rights reserved.
*/
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