JavaScript私有方法

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 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.

答

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();
    }
}

JavaScript私有方法

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