Take Windows 10 as an example

premise

NodeJS has been installed and configured.

install

cmd enters the Windows command line window, enters the test directory, C: Develop gulptest, and executes under the test directory if no creation is required.

C:\Develop>mkdir gulptest
C:\Develop>cd gulptest
C:\Develop\gulptest>npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help json` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg>` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
package name: (gulptest)
version: (1.0.0)
description:
entry point: (index.js)
test command:
git repository:
keywords:
author:
license: (ISC)
About to write to C:\Develop\gulptest\package.json:

{
  "name": "gulptest",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}


Is this OK? (yes)

Next he will ask you to fill in some project information, which can be filled in later, so just go all the way back. He will generate a package.json file in the directory.

Global Installation gulp

C:\Develop\gulptest>npm install gulp-cli -g
C:\Develop\gulptest>npm install gulp -g

Install Gulp into the project

Enter the following command to install gulp into the current project and tell the package.json that you used gulp

npm install gulp -D

Create gulpfile.js under the project root directory

Install plug-ins

npm install gulp-uglify -D

Write gulpfile.js

//Get the gulp just installed
var gulp = require('gulp')

//Get the gulp-uglify module just installed
var uglify = require('gulp-uglify')

//Compressing js files
//Start this task at the command line using gulp uglifyscript
gulp.task('uglifyscript', done => {
    // 1. Find the document
    gulp.src('src/js/*.js')
    // 2. Compressed files
    .pipe(uglify())
    // 3. Save compressed files
    .pipe(gulp.dest('dist/js'))

    done()
})