gulp配置實現修改js、css、html自動刷新

寫在前面：

本配置支持es6、less、react

1.首先

給出初始的目錄結構

給出執行gulp后的目錄結構

給出執行gulp --p后的目錄結構

2.package.json里是一個寫入。文件描述了npm包的相關配置信息（作者、簡介、包依賴等）和所需模塊。

{"name": "gruntTest", "version": "1.0.0","description": "","main": "Gulpfile.js"
}

3.Gulpfile.js添加要執行的任務

var gulp = require('gulp');
var uglify = require('gulp-uglify');  //js壓縮
var concat = require('gulp-concat');  //合并文件
var minifyCSS = require('gulp-minify-css');  //css壓縮
var less = require('gulp-less');  //less
var changedInPlace = require('gulp-changed-in-place');//不管修改哪個文件，gulp會簡化DEST里的html文件
var minifyHTML = require('gulp-htmlmin');  //簡化html
var browserSync = require('browser-sync').create(); //自動刷新
var babel = require('gulp-babel'); //支持es6
var argv = require('yargs').argv; //支持不同環境
var sequence = require('gulp-sequence'); //按照順序執行
var watch = require('watch');  //監聽
var clean = require('gulp-clean');  //監聽
//npm install --save-dev gulp-babel babel-preset-es2015
var DEST = 'dest/';
var HTML_PATH = './src/*.html';gulp.task('minify-js', function(){if(argv.p){gulp.src('src/source/*.js').pipe(babel({presets: ['es2015','react']})).pipe(uglify()).pipe(concat('gruntTest.min.js')).pipe(gulp.dest(DEST+'js'))}else{gulp.src('src/source/*.js').pipe(babel({presets: ['es2015','react']})).pipe(uglify()).pipe(concat('gruntTest.min.js')).pipe(gulp.dest('src/js'))		}		
});
gulp.task('minify-css', function(){if(argv.p){gulp.src('src/less/*.less')  //或者用['src/less/p1.less','src/less/p2.less'].pipe(less()).pipe(minifyCSS()).pipe(concat('style.min.css')).pipe(gulp.dest(DEST+'css')).pipe(browserSync.stream());	}else{gulp.src('src/less/*.less')  //或者用['src/less/p1.less','src/less/p2.less'].pipe(less()).pipe(minifyCSS()).pipe(concat('style.min.css')).pipe(gulp.dest('src/css')).pipe(browserSync.stream());}
});
gulp.task('minify-html', function(){gulp.src(HTML_PATH).pipe(changedInPlace({firstPass: true})).pipe(minifyHTML({collapseWhitespace: true})).pipe(gulp.dest(DEST)).pipe(browserSync.stream());
});
gulp.task('clean', function () {gulp.src(['./src/css/*.css','./src/js/*.js'], {read: false}).pipe(clean());
});
var files = ['./src/css/*.css','./src/js/*.js'
];
gulp.task('browser-sync', function(){browserSync.init(files,{server: {baseDir: './'},port: 9999});
});
gulp.task('watch', function() {gulp.watch('./src/source/*.js',['minify-js']);gulp.watch('./src/less/*.less',['minify-css']);	
});
if(argv.p){//productgulp.task('default', sequence('minify-js','minify-css','minify-html','browser-sync'));
}else{//developgulp.task('default', sequence('clean','minify-js','minify-css','watch','browser-sync'));
}

4.擴展

（1）上面一堆require看著好煩人，也很龐大。此處可以引入“gulp-load-plugins”插件

var gulpLoadPlugins = require('gulp-load-plugins'),plugins = gulpLoadPlugins();plugins.uglify();即可執行相應任務

（2）若某個文件夾下好多文件，那么watch監聽時需要一一列舉，可以目錄寫成json格式（例如src.source.*.js）。通過引入“fs”插件，用fs.freaddirSync()方法去讀路徑。循環即可，此處的實現純屬寫js代碼。

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