JavaScript私有方法 [英] JavaScript private methods

问题描述

要使用公共方法创建JavaScript类，我会执行以下操作：

To make a JavaScript class with a public method I'd do something like:

function Restaurant() {}

Restaurant.prototype.buy_food = function(){
   // something here
}

Restaurant.prototype.use_restroom = function(){
   // something here
}

这样我班级的用户可以：

That way users of my class can:

var restaurant = new Restaurant();
restaurant.buy_food();
restaurant.use_restroom();

如何创建可由 buy_food <调用的私有方法和 use_restroom 方法但不是该类用户的外部方法？

How do I create a private method that can be called by the buy_food and use_restroom methods but not externally by users of the class?

换句话说，我希望我的方法实现能够：

In other words, I want my method implementation to be able to do:

Restaurant.prototype.use_restroom = function() {
   this.private_stuff();
}

但这不起作用：

var r = new Restaurant();
r.private_stuff();

如何将 private_stuff 定义为私有方法所以这两个都适用？

How do I define private_stuff as a private method so both of these hold true?

我读过 Doug Crockford的写法几次，但看起来不像私有方法可以通过公共方法调用，特权方法可以在外部调用。

I've read Doug Crockford's writeup a few times but it doesn't seem like "private" methods can be called by public methods and "privileged" methods can be called externally.

推荐答案

你可以做到，但缺点是它不能成为原型的一部分：

You can do it, but the downside is that it can't be part of the prototype:

function Restaurant()
{
    var myPrivateVar;

    var private_stuff = function()   // Only visible inside Restaurant()
    {
        myPrivateVar = "I can set this here!";
    }

    this.use_restroom = function()   // use_restroom is visible to all
    {
        private_stuff();
    }

    this.buy_food = function()    // buy_food is visible to all
    {
        private_stuff();
    }
}

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