node.js (NRM altitude yarn bower)

Modular commonJS

commnJs is a major I normative js to the back end of the performance and development of

Note: commonJS is nodejs default management module does not support modular management es6 but supports all es6 + syntax

node.js modules are divided into three types:
built-in module node module comes with its own
third-party modules packaged modules need to use someone else (npm install -g module name) to download the project
from its own custom module package module

• Custom Modules

exports. custom attribute = value of
bulk properties may output multiple outputs are

// a.js 文件内容
let aa = 100;
let bb = 200;
exports.aa = aa;
exports.bb = bb;

//b.js文件内容 
let b = require("./a.js");
console.log(b) //结果如下
{ aa: 100, bb: 200 }

module.exports = value
output only once

//a.js文件内容
let a = 10
let b = "bmw"
let fn = ()=>{
    console.log("函数")
}
class Person{
    constructor(){
        console.log("这是Person的构造函数")
    }
    show(){
        console.log("这是show方法...")
    }
}

module.exports = {
    a,b,fn,Person2:Person
}

//b.js文件内容
let a1 = require("./mod/b")
console.log(a1)//结果如下
{ a: 10, b: 'bmw', fn: [Function: fn], Person2: [Function: Person] }

asl

Download npm package management tool node comes
Role: Installation and Management Pack

• Installed in the global environment

安装   npm i 包名 -g 
写在  npm uninstall -g 
g : global 全局的意思

• Installation to the project environment
• Initialize the project environment

方法1
npm init  
需要 自己配置一些参数 
方法2 
npm init -y 
参数自动生成  但是目录名必须是英文 

Initialization completion generates two files
package.json file management pack
package-lock.json dependent files used to cure

{
  "name": "npm",	//项目名称
  "version": "0.0.1",	//版本
  "description": "test and play",	//描述
  "main": "index.js", //入口文件
  "dependencies": {  //项目依赖  上线也要用
    "jquery": "^3.2.1"
  },
  "devDependencies": { //开发依赖 上线就不用
    "animate.css": "^3.5.2"
  },
  "scripts": {	//命令行
    "test": "命令行",
  },
  "repository": {	//仓库信息
    "type": "git",
    "url": "git+https://github.com/alexwa9.github.io/2017-8-28.git"
  },
  "keywords": [  //关键词
    "test",'xx','oo'
  ],
  "author": "wan9",
  "license": "ISC",	//认证
  "bugs": {
    "url": "https://github.com/alexwa9.github.io/2017-8-28/issues"//问题提交
  },
  "homepage": "https://github.com/alexwa9.github.io/2017-8-28#readme"//首页
}

• Download project dependencies
  can only be on the line in the current project also relies --save

//安装
npm i 包名 --save 
npm install 包名 -S 
npm install 包名@x.x.x -S

//卸载
npm uninstall 包名  --save
npm uninstall 包名  -S

• Download Development dependencies

In the writing project when you do not need to use the line item --save-dev

npm install 包名 --save-dev
npm install 包名 -D

• View package

npm list 列出所有已安装包 
npm outdated 版本对比(安装过的包)
npm info 包名  查看当前包的概要信息 
npm view 包名 versions 查看包历史版本列表

• Install all dependencies

npm install   //安装package.json里面指定的所有包  

• Version constraint

^x.x.x   约束主版本，后续找最新
~x.x.x   保持前两位不变，后续找最新
*		 装最新
x.x.x 	 定死了一个版本

Select source

Select the image source installation kit npm install nrm -g
See all source nrm ls
test all sources nrm test
handover source nrm use source name

• Installation Caton solution

ctrl + c -> npm uninstall 包名  ->  npm cache verify 清除缓存 -> 换4g网络 -> npm install 包名 

Release package

• In npm official website to register an account
  

• log in

  At the command line, type npm login sign in
  and then enter a user / password / email

• Creating a Package

  asl s init

  Create a file entry index.js

  Output prepared
  for example as follows:

//sum.js文件
const sum = (a,b) => {
    return a + b
}

module.exports = sum;

//index.js 文件
const sum = require("./sum")
module.exports = {
    sum
}

//package.json文件
{
  "name": "gengwentuo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "nodemon index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

• release

npm publish
Note: To check the value package.json file name exists in the npm official website

• Iteration

Meaning that after you upload packet modification
at the time of publication inside the file version number should change my package.json

• delete

npm unpublish

Published iteration package needs to be deleted in the package directory
delete packages sometimes need to send a message

bower

• Global installed bower
  

bower i -g package name (installation)
Bower Uninstall package name -g (unloaded)

• Initialize the project environment

bower init
generated bower.json third-party package configuration file management

• Download Project Dependencies

// install
bower install the package name #xxx -S (specify the version #)
// unload
bower uninstall package name

• Download the development of dependence

bower install the package name -D

yarn

• Recommend Quguan network download yarn

• Initialize the project

yarn init

• Download Package

yarn add 包名
yarn add 包名@x.x.x -S //下载
yarn add 包名@x.x.x -D  // 

• Delete Package

yarn remove 包名

• All package installation project

yarn  或者  yarn install 

• Use yarn install a global

yarn gloabal add 包名
yarn gloabal remove 包名