npm install 插件 --save與 --save -dev的區別

npm i 插件   ，會把插件安裝到node_modules目錄中，不會修改package.json,

npm i 插件 --save  ，項目發佈上線以後還會依賴用到的插件，沒有這些插件，項目不能運行

自動更改package.json  

"dependencies": {
  "axios": "^0.16.1",
  "vue": "^2.2.6",
 "vue-infinite-scroll": "^2.0.1",
 "vue-lazyload": "^1.0.5",
 "vue-resource": "^1.3.1",
 "vue-router": "^2.3.1",
 "vuex": "^2.3.1"
},


npm i 插件 --save-dev ，安裝到開發依賴中，項目上線以後不會用到的插件，例如'babel-loader',項目解析完發佈
自動更改package.json  

"devDependencies": {
  "autoprefixer": "^6.7.2",
 "babel-cli": "^6.24.1",
 "babel-core": "^6.22.1",
 "babel-loader": "^6.2.10",
 "babel-plugin-transform-runtime": "^6.22.0",
 "babel-preset-env": "^1.3.2",
 "babel-preset-stage-2": "^6.22.0",
 "babel-register": "^6.22.0",
 "url-loader": "^0.5.8",
 "vue-loader": "^11.3.4",
 "vue-style-loader": "^2.0.5",
 "vue-template-compiler": "^2.2.6",
 "webpack": "^2.3.3",
 "webpack-bundle-analyzer": "^2.2.1",
 "webpack-dev-middleware": "^1.10.0",
 "webpack-hot-middleware": "^2.18.0",
 "webpack-merge": "^4.1.0"},