It has the following functions

      Merge JS files       Compressed JS file       Unit testing (based on QUnit)       In a word: automation

  Here’s how to install it.

Install node

Refer to the nodejs primer (the latest node will automatically install NPM)

Install the grunt command line tool grunt-cli

Use the -g global installation so you can use it in any directory. Command: NPM install -g grunt-cli

It is important to note that in Linux or MAC sometimes will report no permissions error, in this case must be preceded by a sudo,

After installation, you can view the version of the change tool. Command: grunt -version

Install grunt and its plug-ins

Go to the root directory of a project and use the command NPM install grunt —save-dev

At this point, a review of the grunt version adds a 4.0, as shown below