Introduction to NodeJS, NPM installation and configuration steps (windows version) and environment variables

This article mainly introduces the installation and configuration steps of NodeJS, NPM (windows version) and detailed explanation of environment variables. It has certain reference value. Interested friends can refer to

1. Windows version NodeJS installation is relatively convenient (after version v0.6.0, windows native is supported), you only need to log in to the official website (http://nodejs.org/), you can see the "INSTALL" button on the homepage, click it directly and it will automatically download installed.

##2. The installation process is basically just "NEXT". (The Windows installation msi file will directly add the path system variable during the process, and the variable value is your installation path, such as "C:\Program Files\nodejs").

3. After the installation is complete, you can use cmd (win r and enter cmd to enter) to test whether the installation is successful. Method: Enter node -v under cmd. When the version prompt shown below appears, the installation of NodeJS is completed.

4. npm installation. Since the new version of NodeJS has integrated npm, npm was also installed before. You can also use the cmd command line to enter "npm -v" to test whether the installation is successful. As shown below, if the version prompt appears, it will be OK.

5. The construction of regular NodeJS has been completed so far. If you are impatient, you can enter "node" in "cmd" to enter the node development mode and enter your The first sentence of NodeJS: "hello world" - input: console.log('hello world').

6. npm is a NodeJS module management. Before, I did not read the information systematically, so I took a long detour when installing and configuring the module, so now it is necessary to list it and record it. .

①. We must first configure the storage path of npm's global module and the cache path. For example, if I want to put the above two folders in the main directory of NodeJS, I will create "node_global" and "node_global" under NodeJs. "node_cache" two folders. As shown below

②, start cmd, enter

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

③, now let’s try installing a module, select express More commonly used modules. Also in the cmd command line, enter "npm install express -g" (the "-g" parameter means to install it in the global directory, which is the "C:\Program Files\nodejs\node_global" set above.) . After the installation process in cmd is completed, you will be prompted where "express" is installed, its version and its directory structure. As shown below

④, close cmd, open the system dialog box, right-click "My Computer" and "Properties"-"Advanced System Settings"-" Advanced"-"Environment Variables". As shown below

⑤, enter the environment variables dialog box, create a new "NODE_PATH" under the system variables, enter "C:\Program Files\nodejs\ node_global\node_modules". (ps: This step is very critical.)

2014.4.19 New: Since the default address of the module has been changed, the above user variables must be changed accordingly (the user variable "PATH" is changed to "C:\Program Files\nodejs\node_global\"), otherwise the input command will cause the error "xxx is not an internal or external command, nor an operable program or batch file" when entering the command.

⑥. If the above steps are OK, we can open the cmd command line again, enter node, and enter "require('express')" to test whether the node's module global path is configured correctly. If correct, cmd will list express related information. As shown below (if there is an error, it is usually because the configuration of NODE_PATH is incorrect, you can check steps ④⑤)

7. Conclusion.

The above is what I did when installing and configuring NodeJS. Because I am a newbie, I used Google to check a lot of information. I hope it will be helpful to friends who have just started to contact NodeJS.

PS: The IDE I am using now is the Sublime text 2 NodeJS plug-in combination. It can compile node programs directly in Sublime, which is very convenient.

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