3、npm-cnpm-yarn

一、npm

npm config set registry https://registry.npm.taobao.org --global
npm config set disturl https://npm.taobao.org/dist --global

二、cnpm

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

三、yarn

cnpm i yarn -g
yarn config set registry https://registry.npm.taobao.org
yarn add koa
yarn remove koa

npm                                            cnpm                                            yarn
npm init -y                            cnpm init -y                            yarn init -y
npm i koa -S                        cnpm i koa -S                            yarn add koa
npm uninstall koa -S        cnpm uninstall                         koa -S    yarn remove koa