安装npm cnpm

打开官网https://www.npmjs.com/get-npm

Install npm

npm is installed with Node.js

npm is distributed with Node.js- which means that when you download Node.js, you automatically get npm installed on your computer.

下载安装好node.js（NPM 顺便会安装好）

Check that you have node and npm installed

To check if you have Node.js installed, run this command in your terminal:

输入指令： node -v
           

To confirm that you have npm installed you can run this command in your terminal:

输入指令： npm -v
           

update npm versions

npm versions

npm is a separate project from Node.js, and tends to update more frequently. As a result, even if you’ve just downloaded Node.js (and therefore npm), you’ll probably need to update your npm. Luckily, npm knows how to update itself! To update your npm, type this into your terminal:

npm install [email protected] -g
           

（npm转 cnpm 可选可不选，速度可能会快一些）

npm install -g cnpm --registry=https://registry.npm.taobao.org