转载：gulp3.0和4.0基本用法

gulp3.0基本用法  https://www.cnblogs.com/2050/p/4198792.html

gulp4.0基本用法gulpfile.js配置调用  https://www.cnblogs.com/2050/p/4198792.html

var gulp = require('gulp');
var rename = require('gulp-rename');//重命名
var uglify=require('gulp-uglify');//js压缩
var watch=require('gulp-watch');//监视
var less=require('gulp-less');//编译less
var minifyCss = require("gulp-minify-css");//压缩CSS
var minifyHtml = require("gulp-minify-html");//压缩html
var jshint = require("gulp-jshint");//js检查
var imagemin = require('gulp-imagemin');
var pngquant = require('imagemin-pngquant'); //png图片压缩插件
var connect=require('gulp-connect');//引入gulp-connect模块 
// gulp.task('min', function () {
//     gulp.src('copyUrl/js/resize.js') // 要压缩的js文件
//     .pipe(uglify()) //使用uglify进行压缩,更多配置请参考：
//     .pipe(rename('resize.min.js'))
//     .pipe(gulp.dest('dist/fot')); //压缩后的路径
// });
 
gulp.task('watchs',function(){
    gulp.watch('cug_vatti_Backpass/*.html',gulp.series('html'));
    gulp.watch('cug_vatti_Backpass/css/*.less',gulp.series('css'));
    gulp.watch('cug_vatti_Backpass/js/*.js',gulp.series('js'));
})
gulp.task('connect',function(){
    connect.server({
        root:'cug_vatti_Backpass',//根目录
        // ip:'192.168.11.62',//默认localhost:8080
        livereload:true,//自动更新
        port:9909//端口
    })
})
 
gulp.task('html',function(){
    return gulp.src('cug_vatti_Backpass/*.html')
    .pipe(gulp.dest('dist/html'))
    .pipe(connect.reload());
})
 
gulp.task('css',function(){
    return gulp.src('cug_vatti_Backpass/css/*.less')
    .pipe(less())//编译less
    .pipe(gulp.dest('cug_vatti_Backpass/css')) //当前对应css文件
    .pipe(connect.reload());//更新
})
 
gulp.task('js',function(){
    return gulp.src('cug_vatti_Backpass/js/jquery-1.8.0.min.js')
    .pipe(jshint())//检查代码
    .pipe(uglify())//压缩js
    .pipe(gulp.dest('dist/js'))
    .pipe(connect.reload());
})
 //gulp.series|4.0 依赖
 //gulp.parallel|4.0 多个依赖嵌套
gulp.task('default',gulp.series(gulp.parallel('connect','watchs','html','css','js')));

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