** 默认执行命名时，针对的是当前目录环境。如果加上 -g 参数，则表示针对的是全局生效。**
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npm config get registry
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npm config set registry http://registry.npm.taobao.org/
# npm config set registry https://registry.npmjs.org/
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npm install [package name] --registry=https://registry.npm.taobao.org
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npm config set proxy http://proxy.example.com:8080
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npm config delete proxy
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npm install [package name] -g
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npm install [package name] --save
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npm install [package name] --save-dev
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npm install [package name]@latest --save
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npm install [package name]@1.0.0 --save
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- 指定安装大于等于@1.0.0 小于 2.2.0 版本
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npm install [package name]@">=2.0.0 <1.0.0" --save
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npm uninstall [package name] -g
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npm uninstall [package name]
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