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HomeWeb Front-endHTML Tutorial使用Gulp进行Javascript以及css压缩合并_html/css_WEB-ITnose

1.安装gulp

gulp是基于Node.js的前端构建工具。所以首先需要安装nodejs,安装nodejs。

完成nodejs安装之后,需要使用npm安装gulp。

先安装全局gulp

npm install -g gulp然后在项目根目录下安装本地gulp。

此时项目根目录下会多出下面这个文件夹 node_modules

好的,现在gulp已经安装完成了,但是gulp本身不提供js压缩合并等功能,需要使用gulp的相关插件。目前只需要完成js压缩合并和css文件压缩的功能,先安装相应的插件:

1.css压缩 gulp-minify-css

2.js压缩 gulp-uglify

3.js合并 gulp-concat

由于压缩之前需要对js代码进行代码检测,压缩完成之后需要加上min的后缀,我们还需要安装另外两个插件:

4.重命名 gulp-rename

5.js代码检测 gulp-jshint (或gulp-jslint)

(更多插件可以查看 http://gulpjs.com/plugins/)

在项目根目录下执行以下命令:

npm install gulp-minify-css gulp-uglify gulp-concat gulp-rename gulp-jshint –save-dev安装好的插件会出现在上面提到的node_modules文件夹中。

2.使用gulp

ok,现在可以使用gulp了,在项目根目录下创建gulpfile.js文件。

在gulpfile.js中添加以下代码

var gulp = require('gulp'),    minifycss = require('gulp-minify-css'),    concat = require('gulp-concat'),    uglify = require('gulp-uglify'),    rename = require('gulp-rename'),    jshint=require('gulp-jshint');    //语法检查    gulp.task('jshint', function () {        return gulp.src('js/*.js')            .pipe(jshint())            .pipe(jshint.reporter('default'));    });    //压缩css    gulp.task('minifycss', function() {        return gulp.src('css/*.css')    //需要操作的文件            .pipe(rename({suffix: '.min'}))   //rename压缩后的文件名            .pipe(minifycss())   //执行压缩            .pipe(gulp.dest('Css'));   //输出文件夹    });    //压缩,合并 js    gulp.task('minifyjs', function() {        return gulp.src('js/*.js')      //需要操作的文件            .pipe(concat('main.js'))    //合并所有js到main.js            .pipe(gulp.dest('js'))       //输出到文件夹            .pipe(rename({suffix: '.min'}))   //rename压缩后的文件名            .pipe(uglify())    //压缩            .pipe(gulp.dest('Js'));  //输出    });  //默认命令,在cmd中输入gulp后,执行的就是这个任务(压缩js需要在检查js之后操作)    gulp.task('default',['jshint'],function() {        gulp.start('minifycss','minifyjs');   });

上述代码中的相关方法可以查看 gulp API docs

在文件根目录下执行gulp命令:

(如果Js文件有问题时,会出现相应的error提示,按照提示的错误信息修改即可)

bingo,现在可以在css文件夹中看到压缩好的css文件,在js中可以看到合并压缩好的main.min.js 。任务完成,只需要将html中css,js引用的路径修改成新的路径即可。

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