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安装gulp-uglify

作为项目的开发依赖即可

$ npm gulp-uglify --save-dev

压缩js文件

gulpfile.js

const gulp = require('gulp');
const uglify = require('gulp-uglify');

gulp.task('uglifyjs', function(){
    gulp.src('src/js/**/*.js')
        .pipe(uglify())
        .pipe(gulp.dest('dist/js'));
});

执行gulp

$ gulp uglifyjs