nodejs01--什么是nodejs，nodejs的基本使用

nodejs使用范围

-直接在cmd命令行运行，在你的电脑上直接运行
-可以搭建一个web服务器(express,koa)

-一些基本的使用
-modules是如何工作的
-npm管理modules
-搭建一个web服务器。

wow,that is awesome

首先当然是下载nodejs的安装包，这里就不再演示了。nodejs官方

modules是如何工作的

建立两个js，moduler01.js moduler02.js

//moduler01js
var _= require('underscore');

var m = require('./modular02.js');

m();
console.log(_);

nodejs
{ [Function]
  _: [Circular],
  VERSION: '1.8.3',
  iteratee: [Function],
  forEach: [Function],
  each: [Function],
  collect: [Function],
  map: [Function],
  inject: [Function],
  foldl: [Function],
  reduce: [Function],
  foldr: [Function],
  reduceRight: [Function],
  detect: [Function],
  find: [Function],
  select: [Function],
  filter: [Function],
  reject: [Function],
  all: [Function],
  every: [Function],
  any: [Function],
  some: [Function],
  include: [Function],
  includes: [Function],
  contains: [Function],
  invoke: [Function],
  pluck: [Function],
  where: [Function],
  findWhere: [Function],
  max: [Function],
  min: [Function],
  shuffle: [Function],
  sample: [Function],
  sortBy: [Function],
  groupBy: [Function],
  indexBy: [Function],
  countBy: [Function],
  toArray: [Function],
  size: [Function],
  partition: [Function],
  take: [Function],
  head: [Function],
  first: [Function],
  initial: [Function],
  last: [Function],
  drop: [Function],
  tail: [Function],
  rest: [Function],
  compact: [Function],
  flatten: [Function],
  without: [Function],
  unique: [Function],
  uniq: [Function],
  union: [Function],
  intersection: [Function],
  difference: [Function],
  zip: [Function],
  unzip: [Function],
  object: [Function],
  findIndex: [Function],
  findLastIndex: [Function],
  sortedIndex: [Function],
  indexOf: [Function],
  lastIndexOf: [Function],
  range: [Function],
  bind: [Function],
  partial: [Function],
  bindAll: [Function],
  memoize: [Function],
  delay: [Function],
  defer: [Function],
  throttle: [Function],
  debounce: [Function],
  wrap: [Function],
  negate: [Function],
  compose: [Function],
  after: [Function],
  before: [Function],
  once: [Function],
  keys: [Function],
  allKeys: [Function],
  values: [Function],
  mapObject: [Function],
  pairs: [Function],
  invert: [Function],
  methods: [Function],
  functions: [Function],
  extend: [Function],
  assign: [Function],
  extendOwn: [Function],
  findKey: [Function],
  pick: [Function],
  omit: [Function],
  defaults: [Function],
  create: [Function],
  clone: [Function],
  tap: [Function],
  isMatch: [Function],
  isEqual: [Function],
  isEmpty: [Function],
  isElement: [Function],
  isArray: [Function: isArray],
  isObject: [Function],
  isArguments: [Function],
  isFunction: [Function],
  isString: [Function],
  isNumber: [Function],
  isDate: [Function],
  isRegExp: [Function],
  isError: [Function],
  isFinite: [Function],
  isNaN: [Function],
  isBoolean: [Function],
  isNull: [Function],
  isUndefined: [Function],
  has: [Function],
  noConflict: [Function],
  identity: [Function],
  constant: [Function],
  noop: [Function],
  property: [Function],
  propertyOf: [Function],
  matches: [Function],
  matcher: [Function],
  times: [Function],
  random: [Function],
  now: [Function: now],
  escape: [Function],
  unescape: [Function],
  result: [Function],
  uniqueId: [Function],
  templateSettings:
   { evaluate: /<%([sS]+?)%>/g,
     interpolate: /<%=([sS]+?)%>/g,
     escape: /<%-([sS]+?)%>/g },
  template: [Function],
  chain: [Function],
  mixin: [Function] }

//moduler02.js
module.exports = function(){
	console.log('nodejs');
}

npm管理modules

npm init //初始化npm管理，生产package.json

{
  "name": "xh",
  "version": "1.0.0",
  "description": "",
  "main": "modular01.js",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "backbone": "^1.3.3",
    "underscore": "^1.8.3"
  }

npm install //如果有package.json 会自动下载dependencies 里面的插件
npm install backbone -S //加上-S,会保存到package.json里面

搭建一个web服务器。

建立一个http.js

var http = require('http');


var server = http.createServer(function(require,response){
	console.log('got a require');
	response.write('hi');
	response.end();
});


server.listen(3000);

//cmd上面输入
node http.js

然后在浏览器里面输入 localhost:3000,就能看到hi