How to install and configure nodejs

How to install and configure nodejs: 1. Download the Node.js version corresponding to the system; 2. Select the installation directory to install; 3. Configure the environment; 4. Install a module for testing.

The operating environment of this article: Windows10 system, nodejs v6.9.2LTS version, DELL G3 computer

How to install and configure nodejs?

Node.js installation and environment configuration for Windows

1. Installation environment

1. Local system: Windows 10 Pro (64-bit)
2. Node.js: v6.9.2LTS (64-bit)

2. Steps to install Node.js

1. Download Node.js corresponding to your system Version: https://nodejs.org/en/download/
2. Select the installation directory for installation
3. Environment configuration
4. Test

3. Preliminary preparation

1. Introduction to Node.js
Simply put, Node.js is JavaScript running on the server. Node.js is a JavaScript runtime environment based on the Chrome V8 engine. Node.js uses an event-driven, non-blocking I/O model, making it lightweight and efficient. Node.js's package manager npm is the world's largest open source library ecosystem.
2. Download Node.js
Open the official website download link: https://nodejs.org/en/download/ What I downloaded here is node-v6.9.2-x64.msi, as shown below:

4. Start the installation

1. After the download is completed, double-click "node-v6.9.2-x64.msi" to start installing Node.js【 Recommended learning: "node.js Video Tutorial"】

Click the [Next] button

Check the checkbox and click the [Next] button

After modifying the directory, click the [Next] button

After installation, click the [Finish] button to complete the installation

Node.js The installation has been completed. You can perform a simple test first to see if the installation is successful. You will also need to configure the environment later
Press the [win R] key on the keyboard, enter cmd, and then press Enter to open the cmd window

The directory after installation is as shown below:

Explanation here: The new version of Node.js has its own npm, which will be installed when Node.js is installed. The role of npm is to manage the packages that Node.js depends on, and can also be understood as being used to install/uninstall. Things that Node.js needs to install

5. Environment configuration

Explanation: The environment configuration here mainly configures the path where the global module installed by npm is located, and the path of the cache. It needs to be configured because when you execute an installation statement similar to: npm install express [-g] (the following optional parameter -g, g represents global installation), the installed module will be installed to [C:\ Users\username\AppData\Roaming\npm] path, occupying C drive space.
For example: I want to put the path of the full module and the cache path in the folder where I installed node.js, then create two folders [node_global] under the folder I installed [D:\Develop\nodejs] ] and [node_cache] as shown below:

After creating two empty folders, open the cmd command window and enter

npm config set prefix "D:\Develop\nodejs\node_global"
npm config set cache "D:\Develop\nodejs\node_cache"

Next set the environment variables, close the cmd window, "My Computer"-right click-"Properties"-"Advanced System Settings"-"Advanced"-"Environment Variables"

Enter the environment variables dialog box, create a new [NODE_PATH] under [System Variables], enter [D:\Develop\nodejs\node_global\node_modules], and change [User Variables] The [Path] under is modified to [D:\Develop\nodejs\node_global]

## 6. Test

After configuration, install a module to test. We will install the most commonly used express module and open the cmd window.

Enter the following command to install the module globally:

npm install express -g     # -g是全局安装的意思

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