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这篇文章主要介绍了如何使用package.json的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇如何使用package.json文章都会有所收获，下面我们一起来看看吧。
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package.json 位于模块的目录下，用于定义包的属性。接下来让我们来看下 express 包的 package.json 文件，位于 node_modules/express/package.json 内容：
{
"name": "express",
"description": "Fast, unopinionated, minimalist web framework",
"version": "4.13.3",
"author": {
"name": "TJ Holowaychuk",
"email": "tj@vision-media.ca"
},
"contributors": [
{
"name": "Aaron Heckmann",
"email": "aaron.heckmann+github@gmail.com"
},
{
"name": "Ciaran Jessup",
"email": "ciaranj@gmail.com"
},
{
"name": "Douglas Christopher Wilson",
"email": "doug@somethingdoug.com"
},
{
"name": "Guillermo Rauch",
"email": "rauchg@gmail.com"
},
{
"name": "Jonathan Ong",
"email": "me@jongleberry.com"
},
{
"name": "Roman Shtylman",
"email": "shtylman+expressjs@gmail.com"
},
{
"name": "Young Jae Sim",
"email": "hanul@hanul.me"
}
],
"license": "MIT",
"repository": {
"type": "git",
"url": "git+https://github.com/strongloop/express.git"
},
"homepage": "http://expressjs.com/",
"keywords": [
"express",
"framework",
"sinatra",
"web",
"rest",
"restful",
"router",
"app",
"api"
],
"dependencies": {
"accepts": "~1.2.12",
"array-flatten": "1.1.1",
"content-disposition": "0.5.0",
"content-type": "~1.0.1",
"cookie": "0.1.3",
"cookie-signature": "1.0.6",
"debug": "~2.2.0",
"depd": "~1.0.1",
"escape-html": "1.0.2",
"etag": "~1.7.0",
"finalhandler": "0.4.0",
"fresh": "0.3.0",
"merge-descriptors": "1.0.0",
"methods": "~1.1.1",
"on-finished": "~2.3.0",
"parseurl": "~1.3.0",
"path-to-regexp": "0.1.7",
"proxy-addr": "~1.0.8",
"qs": "4.0.0",
"range-parser": "~1.0.2",
"send": "0.13.0",
"serve-static": "~1.10.0",
"type-is": "~1.6.6",
"utils-merge": "1.0.0",
"vary": "~1.0.1"
},
"devDependencies": {
"after": "0.8.1",
"ejs": "2.3.3",
"istanbul": "0.3.17",
"marked": "0.3.5",
"mocha": "2.2.5",
"should": "7.0.2",
"supertest": "1.0.1",
"body-parser": "~1.13.3",
"connect-redis": "~2.4.1",
"cookie-parser": "~1.3.5",
"cookie-session": "~1.2.0",
"express-session": "~1.11.3",
"jade": "~1.11.0",
"method-override": "~2.3.5",
"morgan": "~1.6.1",
"multiparty": "~4.1.2",
"vhost": "~3.0.1"
},
"engines": {
"node": ">= 0.10.0"
},
"files": [
"LICENSE",
"History.md",
"Readme.md",
"index.js",
"lib/"
],
"scripts": {
"test": "mocha --require test/support/env --reporter spec --bail --check-leaks test/ test/acceptance/",
"test-ci": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --require test/support/env --reporter spec --check-leaks test/ test/acceptance/",
"test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --require test/support/env --reporter dot --check-leaks test/ test/acceptance/",
"test-tap": "mocha --require test/support/env --reporter tap --check-leaks test/ test/acceptance/"
},
"gitHead": "ef7ad681b245fba023843ce94f6bcb8e275bbb8e",
"bugs": {
"url": "https://github.com/strongloop/express/issues"
},
"_id": "express@4.13.3",
"_shasum": "ddb2f1fb4502bf33598d2b032b037960ca6c80a3",
"_from": "express@*",
"_npmVersion": "1.4.28",
"_npmUser": {
"name": "dougwilson",
"email": "doug@somethingdoug.com"
},
"maintainers": [
{
"name": "tjholowaychuk",
"email": "tj@vision-media.ca"
},
{
"name": "jongleberry",
"email": "jonathanrichardong@gmail.com"
},
{
"name": "dougwilson",
"email": "doug@somethingdoug.com"
},
{
"name": "rfeng",
"email": "enjoyjava@gmail.com"
},
{
"name": "aredridel",
"email": "aredridel@dinhe.net"
},
{
"name": "strongloop",
"email": "callback@strongloop.com"
},
{
"name": "defunctzombie",
"email": "shtylman@gmail.com"
}
],
"dist": {
"shasum": "ddb2f1fb4502bf33598d2b032b037960ca6c80a3",
"tarball": "http://registry.npmjs.org/express/-/express-4.13.3.tgz"
},
"directories": {},
"_resolved": "https://registry.npmjs.org/express/-/express-4.13.3.tgz",
"readme": "ERROR: No README data found!"}name - 包名。
version - 包的版本号。
description - 包的描述。
homepage - 包的官网 url 。
author - 包的作者姓名。
contributors - 包的其他贡献者姓名。
dependencies - 依赖包列表。如果依赖包没有安装，npm 会自动将依赖包安装在 node_module 目录下。
repository - 包代码存放的地方的类型，可以是 git 或 svn，git 可在 Github 上。
main - main 字段指定了程序的主入口文件，require('moduleName') 就会加载这个文件。这个字段的默认值是模块根目录下面的 index.js。
keywords - 关键字
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