###安装 npm install gulp-copy-ext
###使用文档
gulfile.js 编写示例
var gulp = require('gulp');
var copyext = require('gulp-copy-ext');
var src = './src';
var desc = './build';
gulp.task('mcss', function() {
gulp.src(src+'/**/*.css')
.pipe(copyext({
ext: '-debug' //在后缀前加上自定义别名
}))
.pipe(gulp.dest(dest));
});