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npm 5.0.0 之前,有 --save 参数才会把模块写入到 packages.json。现在已经是内置参数,不用额外写了
1、npm 常用的安装命令
npm i 就是npm install 简写 npm i xxx -D 就是 npm i xxx --save-dev npm i xxx -S 就是
npm i xxx --save npm i xxx -g 就是 全局安装 npm i xxx 就是 npm i xxx --save
2、命令参数详解
npm i xxx --save-dev 是把依赖写入进devDependencies对象里面
npm i xxx --save 是把依赖写入进dependencies对象里面
npm i xxx -g 就是安装到全局下,在命令行的任何地方都可以操作,不会提示“命令不存在等错误”
3、依赖和开发时依赖
devDependencies 是开发环境下的依赖,这里是开发环境下的依赖,上线后非必需,比如:webpack,gulp等压缩打包工具.
dependencies 是生产环境下的依赖,项目刚需的依赖在这里,比如UI框架,字体文件等线上必需的东西.
一般这个配置在package.json文件中.