package.json

定義了項目所須要的各類模塊，以及項目的配置信息（好比名稱、版本、許可證等元數據）

npm install 命令根據這個配置文件，自動下載所需的模塊，也就是配置項目所需的運行和開發環境。

package.json 文件能夠手工編寫，也能夠使用npm init命令自動生成

package-lock.json 是用來鎖定安裝時的包的版本號，而且須要上傳到git，以保證其餘人在npm install時你們的依賴能保證一致。

//package.json
{
  "name": "vv",  //項目名稱
  "version": "0.0.0",  //項目版本（遵照「大版本.次要版本.小版本」的格式）
  "description": "A Vue.js project",  //名稱
  "author": "",  
  "private": true,  
  "scripts": {  //npm命令行縮寫
    "dev": "webpack-dev-server --inline --progress --config build/webpack.dev.conf.js",
    "start": "npm run dev",
    "build": "node build/build.js"
  },
  "dependencies": {  //項目運行所依賴的模塊
    "axios": "^0.18.0",
    "echarts": "^4.1.0",
    "echarts-wordcloud": "^1.1.3",
    "element-ui": "^2.3.8",
    "less": "^3.9.0",
    "less-loader": "^4.1.0",
    "sass": "^1.3.2",
    "vue": "^2.5.2",
    "vue-axios": "^2.1.1",
    "vue-resource": "^1.5.0",
    "vue-router": "^3.0.1"
  },
  "devDependencies": {  //項目開發所須要的模塊
    "autoprefixer": "^7.1.2",
    "babel-core": "^6.22.1",
    "babel-helper-vue-jsx-merge-props": "^2.0.3",
    "babel-loader": "^7.1.1",
    "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-cli": "^3.1.2",
    "webpack-dev-server": "^2.9.1",
    "webpack-merge": "^4.1.0"
  },
  "peerDependencies": {  //供插件指定其所須要的主工具的版本
    "chai": "1.x" 
  },
  "bin": {  //指定各個內部命令對應的可執行文件的位置
    "someTool": "./bin/someTool.js"
  },
  "config" : { "port" : "8080" },   //添加命令行的環境變量
  "engines": {  //項目所須要的node.js版本
    "node": ">= 6.0.0",
    "npm": ">= 3.0.0"
  },
  "browserslist": [ //設置項目的瀏覽器兼容狀況
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
複製代碼

更多字段請參考（segmentfault.com/a/119000001…