Node js overview

17. © 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected]© 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected] Objects:  global  process  Console  module  exports functions:  Buffer  require()  setTimeout(cb,ms) , clearTimeout(t)  setInterval(cb,ms) , clearInterval(t)

19. © 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected]© 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected] var circle = require('./circle.js'); console.log('The area of radius 4: '+ circle.area(4)); foo.js var PI = Math.PI; exports.area = function (r) {return PI * r * r;}; exports.circumference = function (r) {return 2 * PI * r;}; circle.js The variable PI is private to circle.js exports === module.exports

21. © 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected] console.log('a starting'); exports.done = false; var b = require('./b.js'); console.log('in a,b.done= %j', b.done); exports.done = true; console.log('a done'); console.log('b starting'); exports.done = false; var a = require('./a.js'); console.log('in b,a.done= %j', a.done); exports.done = true; console.log('b done'); console.log('main starting'); var a = require('./a.js'); var b = require('./b.js'); console.log('in main, a.done=%j, b.done=%j', a.done, b.done); b.jsa.js main.js b.js tries to load a.js. In order to prevent an infinite loop an unfinished copy of the a.js exports object is returned to the b.js module. main starting a starting b starting in b, a.done = false b done in a, b.done = true a done in main, a.done=true, b.done=true Output

22. © 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected]© 2014 All rights reserved. Tel: 054-5-767-300, Email: [email protected]  https  Net  Os  Path  Punycode  Querystring  Readline  Repl  string_decoder  Tls  Tty  url  Util  Vm  zlib

Node js overview

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Node js overview