如何在JS中引用当前对象的属性 [英] How to reference properties of current object in JS

问题描述

可能的重复:
对象字面量声明中的自引用

我在 JS 中有一些简单的对象，比如这个例子:

I have some simple objects in JS like this example:

var object = {
 firstname : 'john',
 lastname : 'paul',
 wholename : firstname + lastname
}

好吧，这个简单的事情行不通；john 和 paul 在全名中未定义，因此我尝试使用this"运算符，该运算符仅在我执行函数 (getWholeName(){return this.firstname+this.lastname} ) 时才有效.但是如果我想使用一个变量而不是一个函数，我该怎么办?我也试过 object.firstname + object.lastname 但它不起作用.

Well this simple thing doesn't work; john and paul are undefined in wholename, so I tried to use the 'this' operator which works ONLY if I do a function (getWholeName(){return this.firstname+this.lastname} ). But if I want to use a variable and not a function, how can I do? I also tried object.firstname + object.lastname but it doesn't work.

推荐答案

没有办法引用对象，但是可以动态添加属性:

There is no way to reference the object, but you can add the properties dynamically:

var object = { 
    firstname : 'john', 
    lastname : 'paul'
};

object.wholename = object.firstname + object.lastname;

为什么不把它包装在一个函数中?

And why not wrap it in a function?

var makePerson = function (firstname, lastname) {
    return {
        firstname: firstname,
        lastname: lastname,
        wholename: firstname + lastname  // refers to the parameters
    };
};

var object = makePerson('john', 'paul');

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