如何访问数字属性? [英] How to access a numeric property?

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问题描述

我有一个像这样的对象:

I have an object like:

var myObject = { '0' : 'blue' };

现在,当我尝试访问键'0'的值时:

Now, when I try to access the value of the key '0' like:

myObject.0 

...我收到了一个错误。 (也许这不是正确的方法?)

...I am getting an error. (Maybe this is not the proper way?)

如何访问数字键的值(如上所述)?

How can I access the value of a key that is a number (like the above)?

推荐答案

这应该有效:

myObject["0"]

myObject [propertyName] myObject.propertyName 的替代语法。)

您收到错误是因为,在JavaScript中,标识符不能以数字开头。来自变量页面developer.mozilla.org/rel =noreferrer> Mozilla开发人员中心:

You're getting the error because, in JavaScript, identifiers can't begin with a numeral. From the Variables page at the Mozilla Developer Centre:


JavaScript标识符必须以$ b开头$ b带字母,下划线(_)或
美元符号($);后续字符
也可以是数字(0-9)。因为
JavaScript区分大小写,所以字母
包括字符A到Z
(大写)和字符a
到z(小写)。

A JavaScript identifier must start with a letter, underscore (_), or dollar sign ($); subsequent characters can also be digits (0-9). Because JavaScript is case sensitive, letters include the characters "A" through "Z" (uppercase) and the characters "a" through "z" (lowercase).

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