OOP Javascript - 是“获取属性"吗?方法有必要吗? [英] OOP Javascript - Is "get property" method necessary?

问题描述

给定一个非常简单的 js 对象构造函数及其原型...

Given a very simple js object constructor and its prototype...

    function MyTest(name)
    {
        this.name = name;
    }

    MyTest.prototype =
    {
        getName: function()
        {
            var myName = this.name;
            return myName;
        },
        myMethod: function()
        {
            //
        }
    }

现在，在 myMethod 中，使用this.getName"和this.name"有什么区别?

Now, in myMethod, is there any difference between using "this.getName" and "this.name"?

谢谢

推荐答案

取决于 name 是对象还是原始类型(boolean、string、int).

Depends on whether name is an object nor a primitive (boolean, string, int).

如果name 是一个原语/字符串，并且你使用了this.getName()，你将无法修改this 的值.name 这样做(假设 this.name = "Billy")

If name is a primitive/ string, and you use this.getName(), you won't be able to modify the value of this.name by doing this (assuming this.name = "Billy")

this.getName() = "213" //this.name still has a value of "Billy"

如果 name 是一个对象 this.name = { firstName: "Billy", lastName: "Bob"};

this.getName().firstName = "Willy"; //this.name now has a value of { firstName: "Willy", lastName: "Bob"}  

这是因为 JavaScript 按值传递基元，但按引用传递对象.

This is due to JavaScript passing primitives by value, but passing objects by reference.

这篇关于OOP Javascript - 是“获取属性"吗?方法有必要吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！