什么是 npm 命令以及如何使用它？

Question

What is npm?

Whenever I browse through some project they ask me to run npm command, something like this

npm install -g node-windows

I went through some blogs to learn about npm and I installed node.js, however when I run the above code in node.js, I get the following errors:

When I browsed further, I came to know that the windows user can run the command from the cmd prompt window, but when I do that I get some output like this:

Which just generate a text file nothing else.

So my question are:

1. How to get started with the AngularJS2 ?
2. How to run a npm command?
3. Does I require command prompt to run npm command(in windows), or I can just use Node.js ?

UPDATE 1

When I use the command npm install in my command prompt, I get the following output:

Answer 1

1. How to get started with the angularJS2

   Follow this link and setup the project by following instructions

2. How to run a npm command

   npm stands for Node Package Manager, therefore you need NodeJS installed before you can run npm commands.

   Follow this and install the latest version. And restart the command prompt.

3. Do I require command prompt to run npm command(in windows), or i can just use node.js

   Yes, you need to run npm commands from the command(in windows).

   eg npm install

You get the warning because there is no package.json file present where you are running the command. ENOENT stands for Error NO ENTrey

Navigate to the project folder using the following command and then run npm install

cd <projectpath>

Answer 2

AngularJS 2 website has everything you need covered. Their quickstart guide alongside with the quickseed zip file help a lot.

But, in case you missed some points:

• yes, you will need npm/NodeJS. So, download the latest distribution and have a clean installation of it.

• you can execute the npm command with its parameters from withing the windows cmd.

• the quickseed zip contains all the files you need to see a live and quick example running locally. Unzip it on your workplace and navigate to it using the windows cmd. When inside the root folder of the unzipped package, execute npm install and right after it npm start .

Take the learning path . Step by step all your questions will be answered

Answer 3

您需要使用管理员提示符进行全局安装（ -g ）