Node.js module system

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What is a module? Modules are used to call functions between different node.js files. In other words, a js file can be a module.

1. Create module

main.js file:

var hello = require('./hello');
hello.world();

hello.js file:

exports.world = function() {
  console.log('Hello World');
}

require () is used to obtain the module, and exports is the external interface object of the module. In the above example, require() obtains the interface of the hello module, returns the exports object and assigns it to the hello object. The .world() method serves as the exposed interface.

We can also use the entire object as the external interface.

For example:

//hello.js 
function Hello() { 
    var name; 
    this.setName = function(thyName) { 
        name = thyName; 
    }; 
    this.sayHello = function() { 
        console.log('Hello ' + name); 
    }; 
}; 
module.exports = Hello;//HELLO对象作为接口

Then get this interface in main.js:

//main.js 
var Hello = require('./hello'); 
hello = new Hello(); 
hello.setName('BYVoid'); 
hello.sayHello();

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