需要时初始化模块 [英] Initialize a module when it's required

问题描述

我有一个带有一些初始化代码的模块.加载模块时应执行初始化.此刻，我正在这样做:

I have a module with some initialization code inside. The init should be performed when the module is loaded. At the moment I'm doing it like this:

 // in the module

 exports.init = function(config) { do it }

 // in main

 var mod = require('myModule');
 mod.init(myConfig)

那行得通，但我想更简洁一些:

That works, but I'd like to be more concise:

 var mod = require('myModule').init('myConfig')

init应该返回什么，以保持mod引用正常工作?

What should init return in order to keep mod reference working?

推荐答案

您可以返回this，在这种情况下，它是对exports的引用.

You can return this, which is a reference to exports in this case.

exports.init = function(init) {
    console.log(init);
    return this;
};

exports.myMethod = function() {
    console.log('Has access to this');
}

var mod = require('./module.js').init('test'); //Prints 'test'

mod.myMethod(); //Will print 'Has access to this.'

或者您可以使用构造函数:

Or you could use a constructor:

module.exports = function(config) {
    this.config = config;

    this.myMethod = function() {
        console.log('Has access to this');
    };
    return this;
};

var myModule = require('./module.js')(config);

myModule.myMethod(); //Prints 'Has access to this'

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