drag special system
dss全称：Drag Special System（拖拽型专题系统）
预览地址：DEMO
1、安装NodeJS
此文档编写时，node版本为v8.9.1。
#查看node版本号
node -v
#查看npm包管理版本号
npm -v2、设置镜像
对于大陆用户，建议将npm的注册表源设置为国内的镜像，可以大幅提升安装速度。
切换镜像后可以使用cnpm命令，下载、安装插件会比npm快
3、安装gulp
#全局安装gulp
cnpm i gulp@3 -g 4、安装依赖插件
#这个命令会安装package.json中的插件列表
cnpm i修改样式与脚本都需要先执行以下命令
#开发环境
gulp dev
#生产环境
gulp build启动watch任务，实时监听src/js/*.js文件变化，生成.map后缀文件便于debug
不监听文件变化，生成压缩后的css、js，无map文件。
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