是否可以向 JavaScript 对象添加动态命名的属性? [英] Is it possible to add dynamically named properties to JavaScript object?

问题描述

在 JavaScript 中，我创建了一个像这样的对象:

In JavaScript, I've created an object like so:

var data = {
    'PropertyA': 1,
    'PropertyB': 2,
    'PropertyC': 3
};

如果属性名称直到运行时才确定，是否可以在初始创建后向该对象添加更多属性?即

Is it possible to add further properties to this object after its initial creation if the properties name is not determined until run time? i.e.

var propName = 'Property' + someUserInput
//imagine someUserInput was 'Z', how can I now add a 'PropertyZ' property to 
//my object?

推荐答案

是.

var data = {
    'PropertyA': 1,
    'PropertyB': 2,
    'PropertyC': 3
};

data["PropertyD"] = 4;

// dialog box with 4 in it
alert(data.PropertyD);
alert(data["PropertyD"]);

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