02 downloads a package from the npm, and use this package in the js file

1, create a new folder hello_npm

2, cmd into this folder path

3, npm init (establish a package.json file)

4, npm install math (math installation and related packages)

5, and open hello_npm see node_modules package.json file, open node_modules, a math package which has

 

 

 

 

 

 

 Then you can use this package in our js file

Create a new file in the root directory index.js

index.js in knock:

var math=require('math');

console.log(math);

console.log(math.add(1, 2));

You can see the results:

 

It is used successfully downloaded from the npm package down