Home Web Front-end HTML Tutorial 前端js和css的压缩合并之nodejs_html/css_WEB-ITnose

前端js和css的压缩合并之nodejs_html/css_WEB-ITnose

Jun 24, 2016 am 11:21 AM

From: http://www.cnblogs.com/starweb/archive/2013/01/24/2874838.html

1.安装nodejs

http://nodejs.org/

2.安装各自的node package

js我用的是UglifyJS github地址: https://github.com/mishoo/UglifyJS

css我用的是clean-css github地址: https://github.com/GoalSmashers/clean-css

图片用的是node-smushit    github地址: https://github.com/colorhook/node-smushit

3.编写代码

//js

var  fs = require( 'fs' );

var  jsp = require( "uglify-js" ).parser;

var  pro = require( "uglify-js" ).uglify;

function  jsMinifier(flieIn, fileOut) {

    var  flieIn=Array.isArray(flieIn)? flieIn : [flieIn];

    var  origCode,ast,finalCode= '' ;

    for ( var  i=0; i

     origCode = fs.readFileSync(flieIn[i], 'utf8' );

     ast = jsp.parse(origCode);

     ast = pro.ast_mangle(ast);

     ast= pro.ast_squeeze(ast);

     finalCode += ';' + pro.gen_code(ast);

    }

   fs.writeFileSync(fileOut, finalCode, 'utf8' );

} //jsMinifier('./file-src/test2.js', './file-smin/test-min.js');  //单个文件压缩

jsMinifier([ './file-src/test.js' , './file-src/test2.js' ], './file-smin/test-min.js' ); //合并压缩

命令翻译

UglifyJS使用

uglifyjs [  选项... ] [  文件 ]

文件参数应该放在选项后面,uglifyjs 会读取文件中的javascript代码进行处理。如果你不指定输出的文件名,那么他会把处理后的内容输出到命令行中。

支持的选项 :

●   -b 或 –beautify - 输出格式化代码,当传入该参数,下面的附加选项用于更美观的控制格式化:

●   -i N 或 –indent N - 缩进级别(空格数量)

●   -q 或 –quote-keys - 是否用引号引起字符串对象的键(默认只会引起不能被正确标志的键名)

●   –ascii -默认 UglifyJS 不处理字符编码而直接输出 Unicode 字符,通过传入该参数将非ASCII编码的字符转化为\cXXXX的序列(输出总按照UTF8编码,但传入该选项能得到ASCII编码的输出)。

●   -nm 或 –no-mangle - 不改变变量名称

●   -ns 或 –no-squeeze - 不调用 ast_squeeze() 函数(该函数会做多种优化使得结果更小,可读性略有降低)

●   -mt 或 –mangle-toplevel - 在顶级作用域打乱变量名称(默认不开启)

●   –no-seqs - 当调用 ast_squeeze() 将会合并多个语句块为一个语句块,如 ”a=10; b=20; foo()” 将被转换为 ”a=10,b=20,foo()”

●   –no-dead-code - 默认 UglifyJS 将会删除不被用到的代码,传入该参数禁用此功能。

●   -nc 或 –no-copyright - 默认 uglifyjs 会在输出后的代码中添加版权信息等注释代码,传入该参数禁用此功能。

●   -o 文件名 或 –output 文件名 - 指定输出文件名,如果不指定,则打印到标准输出(STDOUT)

●   –overwrite - 如果传入的JS代码来自文件而不是标准输入,传入该参数,输出会覆盖该文件。

●   –ast - 传入该参数会得到抽象的语法树而不是Javascript,对调试或了解内部代码很有用。

●   -v 或 –verbose - 在标准错误输出一些信息(目前的版本仅输出操作用时)

●   –extra - 开启附加优化,这些优化并未得到全面的测试。

●   –unsafe - 开启其他附加优化,这些优化已知在特定情况下并不安全,目前仅支持:

●   foo.toString() ==> foo+””

●   –max-line-len (默认32K字节) - 在32K字节出增加换行符,传入0禁用此功能。

●   –reserved-names - 一些类库会依赖一些变量,该参数指定的名称不会被混淆掉,多个用逗号隔开

//css

var  cleanCSS = require( 'clean-css' );

function  cssMinifier(flieIn, fileOut) {

    var  flieIn=Array.isArray(flieIn)? flieIn : [flieIn];

    var  origCode,finalCode= '' ;

    for ( var  i=0; i

     origCode = fs.readFileSync(flieIn[i], 'utf8' );

     finalCode += cleanCSS.process(origCode);

    }

   fs.writeFileSync(fileOut, finalCode, 'utf8' );

}

  

//cssMinifier('./file-src/indexw_20120913.css', './file-smin/index.css');  //单个文件压缩

cssMinifier([ './file-src/index_20120913.css' , './file-src/indexw_20120913.css' ], './file-smin/index.css' );

//图片

var  imgMinifier = require( 'node-smushit' );

//imgMinifier.smushit('./file-src/images', {recursive: true}); //递归

imgMinifier.smushit( './file-src/images' );

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