npm install <Module Name> -S -D -g 有什么区别

@爱耍流氓的唐僧  January 26, 2021

npm install <Module Name> -S -D -g 有什么区别?

npm install module_name -S:
npm install module_name --save    写入dependencies

npm install module_name -D:
npm install module_name --save-dev 写入devDependencies

npm install module_name -g 全局安装(命令行使用)
npm install module_name 本地安装(将安装包放在 ./node_modules 下)

dependencies与devDependencies有什么区别呢?
devDependencies 里面的插件只用于开发环境,不用于生产环境
dependencies 是需要发布到生产环境的
Vue中:

{
  "name": "synbio",
  "version": "1.0.0",
  "description": "synbio-tech order shop",
  "author": "AprMay <chunfei.wang@synbio-tech.com>",
  "private": true,
  "scripts": {
    "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
    "start": "npm run dev",
    "build": "node build/build.js"
  },
  "dependencies": {
    "element-ui": "^2.15.0",
    "vue": "^2.5.2",
    "vue-router": "^3.0.1"
  },
  "devDependencies": {
    "autoprefixer": "^7.1.2",
    "babel-core": "^6.22.1",
    "babel-helper-vue-jsx-merge-props": "^2.0.3",
    "babel-loader": "^7.1.1",
    "babel-plugin-syntax-jsx": "^6.18.0",
    "babel-plugin-transform-runtime": "^6.22.0",
    "babel-plugin-transform-vue-jsx": "^3.5.0",
    "babel-preset-env": "^1.3.2",
    "babel-preset-stage-2": "^6.22.0",
    "chalk": "^2.0.1",
    "copy-webpack-plugin": "^4.0.1",
    "css-loader": "^0.28.0",
    "extract-text-webpack-plugin": "^3.0.0",
    "file-loader": "^1.1.4",
    "friendly-errors-webpack-plugin": "^1.6.1",
    "html-webpack-plugin": "^2.30.1",
    "node-notifier": "^5.1.2",
    "optimize-css-assets-webpack-plugin": "^3.2.0",
    "ora": "^1.2.0",
    "portfinder": "^1.0.13",
    "postcss-import": "^11.0.0",
    "postcss-loader": "^2.0.8",
    "postcss-url": "^7.2.1",
    "rimraf": "^2.6.0",
    "semver": "^5.3.0",
    "shelljs": "^0.7.6",
    "uglifyjs-webpack-plugin": "^1.1.1",
    "url-loader": "^0.5.8",
    "vue-loader": "^13.3.0",
    "vue-style-loader": "^3.0.1",
    "vue-template-compiler": "^2.5.2",
    "webpack": "^3.6.0",
    "webpack-bundle-analyzer": "^2.9.0",
    "webpack-dev-server": "^2.9.1",
    "webpack-merge": "^4.1.0"
  },
  "engines": {
    "node": ">= 6.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

事例解释:
你开发一个前端项目,在项目中你需要使用webpack构建你的开发和本地运行环境,这时你就要放到dependencies里。webpack是你用来压缩代码,打包等需要的工具,程序实际运行的时候并不需要,所以放到dev里就ok了。
你写程序要用element-ui,生产环境运行项目时肯定要用到element-ui,这时element-ui就应该安装到dependencies中去。


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