Node模块管理描述文件

当使用npm包管理器下载新的模块时，会有生成两个json文件
package.json是模块描述文件
lock文件是版本控制文件

{
    
  "name": "md5demo",
  "version": "2.0.0",
  "description": "md5引包演示",
  "main": "index.js",
  "scripts": {
    
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "cupido",
  "license": "MIT",
  "dependencies": {
    
    "md5": "^2.3.0"
  }
}

{
    
  "name": "md5demo",
  "version": "2.0.0",
  "lockfileVersion": 1,
  "requires": true,
  "dependencies": {
    
    "charenc": {
    
      "version": "0.0.2",
      "resolved": "https://registry.npmmirror.com/charenc/-/charenc-0.0.2.tgz",
      "integrity": "sha512-yrLQ/yVUFXkzg7EDQsPieE/53+0RlaWTs+wBrvW36cyilJ2SaDWfl4Yj7MtLTXleV9uEKefbAGUPv2/iWSooRA=="
    },
    "crypt": {
    
      "version": "0.0.2",
      "resolved": "https://registry.npmmirror.com/crypt/-/crypt-0.0.2.tgz",
      "integrity": "sha512-mCxBlsHFYh9C+HVpiEacem8FEBnMXgU9gy4zmNC+SXAZNB/1idgp/aulFJ4FgCi7GPEVbfyng092GqL2k2rmow=="
    },
    "is-buffer": {
    
      "version": "1.1.6",
      "resolved": "https://registry.npmmirror.com/is-buffer/-/is-buffer-1.1.6.tgz",
      "integrity": "sha512-NcdALwpXkTm5Zvvbk7owOUSvVvBKDgKP5/ewfXEznmQFfs4ZRmanOeKBTjRVjka3QFoN6XJ+9F3USqfHqTaU5w=="
    },
    "md5": {
    
      "version": "2.3.0",
      "resolved": "https://registry.npmmirror.com/md5/-/md5-2.3.0.tgz",
      "integrity": "sha512-T1GITYmFaKuO91vxyoQMFETst+O71VUPEU3ze5GNzDm0OWdP8v1ziTaAEPUr/3kLsY3Sftgz242A1SetQiDL7g==",
      "requires": {
    
        "charenc": "0.0.2",
        "crypt": "0.0.2",
        "is-buffer": "~1.1.6"
      }
    }
  }
}