第一次使用需要初始化 npm init -y
    npm-tut

{
  "requires": true,
  "lockfileVersion": 1,
  "dependencies": {
    "bootstrap": {
      "version": "4.0.0",
      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.0.0.tgz",
      "integrity": "sha512-gulJE5dGFo6Q61V/whS6VM4WIyrlydXfCgkE+Gxe5hjrJ8rXLLZlALq7zq2RPhOc45PSwQpJkrTnc2KgD6cvmA=="
    },
    "jquery": {
      "version": "3.3.1",
      "resolved": "https://registry.npmjs.org/jquery/-/jquery-3.3.1.tgz",
      "integrity": "sha512-Ubldcmxp5np52/ENotGxlLe6aGMvmF4R8S6tZjsP6Knsaxd/xp3Zrh50cG93lR6nPXyUFwzN3ZSOQI0wRJNdGg=="
    },
    "vue": {
      "version": "2.5.13",
      "resolved": "https://registry.npmjs.org/vue/-/vue-2.5.13.tgz",
      "integrity": "sha512-3D+lY7HTkKbtswDM4BBHgqyq+qo8IAEE8lz8va1dz3LLmttjgo0FxairO4r1iN2OBqk8o1FyL4hvzzTFEdQSEw=="
    }
  }
}
 

npm的常用配置