Function: The size of JavaScript can be compressed. Make JavaScript faster to load.
Usage:
Something that is entered under CMD;
cscript esc.wsf-l 3-ow. /global.js Global.js
The above is a simple example: you can build a bat file under the current directory
cscript esc.wsf-l compression level-ow. /To compress the original JS to the directory that needs to be compressed
1.
Level 0:: No compression//No Place
Level 1:: Comment removal//Delete Comment
Level 3:: NewLine removal//Delete new line
Level 4:: Variable substitution//variable substitution
2. The parameters used in the following illustration:
-L Level
-S
-V
-$
The-oa is overwritten in the form of an append
-ow covered in the form of an overlay
The compressed package used in the attachment also has a help document
Use the example below to see the picture in the compressed package.
Download Address Http://xiazai.jb51.net/201003/yuanma/ESC.rar
Introduction
esc is an ecmascript pre-processor written in jscript, enabling An unlimited number of external scripts to be compressed/crunched into supertight, bandwidth-optimized packages. Featuring several compression-techniques such as comment removal, whitespace stripping, newline stripping and variable substitution esc can reduce the Overall size of your code with up to ~45%. single, multiple scripts and even directories with scripts can be merged together at the compression level you decide. the processed output can later be appended or written to a file, or Piped to another application for further processing via stdout. ESC do Not support crunching of inline scripts. so any attempt passing html, asp, jsp, php or other equivalent documents to esc is done at your own risk. esc supports Four levels of compression, where a higher level equals higher compression. beware though that levels >2 requires your code to be syntaxically perfect or ESC will punish you by producing a broken and useless output. The compression ratio should hit around 25% using the default compression level on A vanilla looking script, but results as high as ~45% can be achieved depending on the script ' S design / your style of writing code. ESC ' s compression engine is Intelligent in the meaning that it has language syntax, statement and keyword awareness and it *knows* about native objects And members provided by the most common scripting hosts. this knowledgebase can easily be extended by pluggin in userdefined maps with additional information to further gain control of the crunching procedure. During processing following things are Taken into account : string and regexpression read-ahead
JScript Conditional compilation statements and variables
ECMA-262 Core Language Definitions (ECMAScript)
Intermediate Dom ' s (Level 0) and DOM Level 1
MS JScript Specific Objects/methods
Netscape/mozilla/opera specific Objects/methods/properties
MS WSH (Windows scripting Host) 1+ native objects
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