package.json詳解

package.json

每一個項目都要有一個​

​package.json​

​檔案（包描述檔案，就像産品的說明書一樣）

這個檔案可以通過​

​npm init​

​自動初始化出來

D:\code\node中的子產品系統>npm init
This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help json` for definitive documentation on these fields
and exactly what they do.

Use `npm install <pkg>` afterwards to install a package and
save it as a dependency in the package.json file.

Press ^C at any time to quit.
package name: (node中的子產品系統)
Sorry, name can only contain URL-friendly characters.
package name: (node中的子產品系統) cls
version: (1.0.0)
description: 這是一個測試項目
entry point: (main.js)
test command:
git repository:
keywords:
author: xiaochen
license: (ISC)
About to write to D:\code\node中的子產品系統\package.json:

{
  "name": "cls",
  "version": "1.0.0",
  "description": "這是一個測試項目",
  "main": "main.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "xiaochen",
  "license": "ISC"
}


Is this OK? (yes)      

• 建議每個項目的根目錄下都有一個​

  ​package.json​

  ​檔案
• 建議執行​

  ​npm install 包名​

  ​​的時候都加上​

  ​--save​

  ​選項，目的是用來儲存依賴資訊