Load module 04 Node.js learning

A file code:

// . 1, a method is the require, its function is used to load the module 
console.log ( "execution B" )
require('./b.js');
console.log ( "execution C" )
the require ( './c'); // where JS suffix may be omitted

// 2, the Node, there is no global scope, only module scope 
@ 2.1 less than the internal external access 
// 2.2 less than the external access also the interior 
var CC = the require ( './ C' );
 // this is CC acquired variables at less than C file 
// console.log (cc.cc);


// . 3, the require method has two functions 
// 3.1, the file is loaded and executed inside the module code 
// 3.2, get loaded docking module exports file exclusive 
var EX = the require ( './ B' );

// will execute the file B Add method 
the console.log (ex.add (30,20 ));
 // Get the value of the variable B file foo 
console.log (ex.foo);

B file code

console.log ( "B document executed" );
 var foo = "BBB" ;
exports.foo=foo;

exports.add=function (x,y) {
    return x*y;
}

C file code

console.log ( "C file executed" );
 var CC = "I'm a C file"