module.exports usage

module.exports objects are created by the module system. When we write a module ourselves, we need to write the module interface at the end of the module to declare that the module exposes the declaration content to the outside world. module.exports provides a method for exposing the interface.

 

1. Return a JSON object

1 var app = {
2     name:'app',
3     version:'1.0.0',
4     sayName:function(name) {
5        console.log(this.name);   
6     }              
7 }
8 
9 module.exports = app;

This method can return a globally shared variable or method.

Call method:

1 var app = require("./app.js");
2 app.sayName('hello');//hello

Or use it like this:

 1 var func1 = function(){
 2  console.log("func1");   
 3 };
 4 
 5 var func2 = function(){
 6 console.log("fun2");
 7 };
 8 
 9 exports.function1 = func1;
10 exports.function2 = func2;

The calling method is:

var functions = require("./functions");
functions.function1();
functions.function2();

2. Return a constructor

CLASS.js

var CLASS = function(args) {
this.args = args;
}

module.exports = CLASS;

transfer:

var CLASS = require("./CLASS.js");
var c = new CLASS('arguments');

3. Return an instance object:

//CLASS.js
var CLASS = function() {
this.name = "class";
}
CLASS.prototype.func = function(){
alert(this.name);
}
module.exports = new CLASS();

transfer:

var c = require("./CLASS.js");
c.func();//"class"