install npm

【Tools official website】

【installation steps】

1. Install node.js

1. Go to the node.js official website to download and install the tool, where the installation path is selected to the D drive, D:\Program Files\nodejs

After the installation is complete, enter the following command on the command line to test whether the installation is successful, and the version number will appear correctly

npm -v

2. Change the original environment variables,

(1) We need to configure the storage path of the global module of npm and the path of the cache. For example, if I want to put the above two folders in the main directory of NodeJS, I will create two "node_global" and "node_cache" under NodeJs. folder, enter the following command to change the npm configuration

npm config set prefix "C:\Program Files\nodejs\node_global"
npm config set cache "C:\Program Files\nodejs\node_cache"

set NODE_PATH=your\directory\to\node_modules;%NODE_PATH%

(2) Add the system variable NODE_PATH to the system environment variable, enter the path D :\Program Files\nodejs\node_global\node_modules, and the modules installed after that will be installed in the changed path

(3) Enter the following command on the command line to try to install express (Note: the parameter "-g" means to install it in the global directory, that is, in the " D:\Program Files\nodejs\node_global " set above. )

 
        npm install express -g

After installation, you can see. \node_global\node_modules\express already has content

(4) Enter node on the command line to enter the editing mode, and enter the following code to test whether the module can be loaded normally:

 
        require( 
        'express' 
        )

Assuming success, you can see output. Assuming an error, check the path in NODE_PATH.

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