node. JS installation (Love front end)

Only a real installation of node will know what node. js is.

node. JS can be installed on any operating system, the underlying is the Chrome V8 engine, why before the Chrome browser parsing JS quickly, because

The Chrome browser is a V8 engine, written in C + +.

Enter the official website http:nodejs.org,

LTS is the latest stable version, current is the newest version

Then there are three ways to install: Windows MAC (Mike) Linux, which is installed in two different ways

One is the MSI installation package version, one is the. zip package version, which will then be configured on Linux, we will first download this,

After I enter the official website to download directly, then the installation path cannot have the Chinese path, for example in the configuration environment variable, if has the Chinese to be very troublesome.

We installed the MSI format of the installation package, it is Microsoft Installer, Microsoft Installer this is a format

Then next, the next step is to install, and now node. JS has been successfully installed

How can you prove that you have installed it now?

We need to open the CMD command-line window of the system, and CMD is the shorthand for Commond, which indicates the command. Linux-like, DOS systems

Use commands in the operating system for such a tool.

Enter Node-v, you can view the current version number, at this time the input command, node-v, ==$ node-v. $ indicates that the normal user # represents the highest administrator, we will later learn in the Linux system, $ means normal permissions can be run.

Note the installation path cannot have Chinese, all settings do not change,

Now let's look at why we can enter the node command.

Now, let's measure it. What are environment variables

All systems have a global environment variable

has been automatically configured, very smart, today, node. JS has helped us configure.

MSI installation has been set up for us automatically, when the environment variable is deleted, the node command will not be used.

Note the $ symbol is a representation of a normal user in the command line of a Linux system.

The system environment variable allows us to open the specified file directly on any disk.

Below we use node to run a JS file

Node followed by a space followed by a file path,

You can drag and drop the file, drag the file directly to the file path can appear

Let's have a good head today!

Which means you want to run who is node,

Now with the absolute path, if you don't want to be so troublesome, you can use the CD to toggle the cursor position

C:\Users\Danny is the cursor position, so now the 1.js is an absolute road strength

or use a CD to find his father, then open 1.js. The path of the system's drive letter has changed, this address is relative address,

Our slogan is:
Who wants to run the node who's

Node environment than browser, browser must use HTML to open JS, and node is not.

At this point you have the second JS runtime environment, the first one is the browser, the second is a node

At this point we prove that Nodejs is a JavaScript runtime environment.

Next lesson we're going to learn the philosophy of node. js

node. JS installation (Love front end)