npm install --save-dev gulp-sass gulp-sourcemaps gulp-autoprefixer

var sass = require(‘gulp-sass‘);var prefix = require(‘gulp-autoprefixer‘);var  maps = require(‘gulp-sourcemaps‘);

var path = {        scss: ‘./www/style/Myself.scss‘,        css: ‘./www/style/‘      } //编译sass       gulp.task(‘sass‘, function() {gulp.src( path.scss)  .pipe(maps.init())    .pipe(sass({ outputStyle: ‘compressed‘ }))      .pipe(maps.write())      .pipe(gulp.dest( path.css ))});gulp.task(‘autoprefix‘, function() {gulp.src( path.css )  .pipe(prefix(‘last 5 versions‘, ‘> 1%‘, ‘ie8‘))  .pipe(gulp.dest( path.css ));  });