Node.js installation and NG (ng command) usage guide

In modern web development, front-end developers use the Angular framework (formerly known as AngularJS) to handle dynamic UI building, and NG (ng command) is the command that enables the Angular system to compile and generate applications. In addition, Node.js is an open source, cross-platform, and efficient JavaScript engine. The purpose of this article is to provide a detailed guide on how to install Node.js and NG commands.

Node.js installation steps

1. First, you need to download the latest version of Node.js. You can find the latest version suitable for your system on the official Node.js website (https://nodejs.org/en/). In addition, you can also find more information related to Node.js on this page.

2. Select the download program. After entering the download page, you can choose the corresponding download program, such as Windows, Mac, etc.

3. Install Node.js through the installation wizard: After downloading, double-click the .exe file (or .dmg, .pkg and other file types) of the program you downloaded, and then follow the installation wizard to install. Follow the prompts for your operating system and the installer will guide you through the steps. If all goes well, the installer will complete the Node.js installation in just a few minutes.

4. Verify that Node.js is installed successfully: After the installer is installed, open a command line terminal and enter the command "node -v" to check whether the installation is successful. If the version number is returned correctly, your installation process was successful.

NG (ng command) steps

1. Install Angular CLI

Open the command line terminal and enter the command "npm install -g @angular/cli ” and press Enter. Preface it with "npm install -g" to install @angular/cli globally on your computer.

2. Check whether Angular CLI is installed successfully

Open the command line terminal and enter the command "ng --version" and press Enter. If the version number of AngularCLI is returned correctly, then you have successfully installed it.

3. Build with NG

Enter "ng new project-name" in the command line terminal to create a new Angular project. Here, "project-name" represents the name of the application you want to create. If you need to create a new Angular project in a different location, enter the cd project name (such as cd new-project) to enter the project directory.

4. Start NG

Go to the project directory, enter "ng serve" and press Enter to start NG. This command will start a development server on localhost. Afterwards, you can access the Angular block you just created by typing "http://localhost:4200" in your browser.

5. Other commonly used NG commands

• Generate new Angular components: The command "ng generate component component-name" can be used to generate new Angular components. It will automatically generate a new component named component-name in the app/component directory, which includes all the code we need.
• Use CLI tools to generate the default structure of other applications: The command "ng new application-name" will generate a new Angular application.
• Run unit tests: The command "ng test" will run unit tests and report the test results.
• Compile the application locally: The command "ng build" will compile the application and generate a dist directory that contains all compiled files.

Summary

In the world of web development, the importance of Node.js and Angular frameworks is self-evident. This guide can help you install and use Node.js and NG easily. There may be some minor changes to the installation process, but the installation method remains essentially the same. Once you have mastered these skills, you still need to continue learning and practicing to better understand and master them.

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