javascript 对象属性名称为十进制表示法

Question

This is a more specific to this question , which only goes as far as discussing keys as numeric whole integers.

In regards to 'numeric or string literal for the name of a property', I've tried this in the Chrome console var obj = { 2.15: 'foo' } console.log(obj[2.15]) and it works. I would not assume it standard across all browsers, especially older ones. However such a key notation as part of a default configuration provided by my users could be useful. I think using Map , though within standards ( 'Any value (both objects and primitive values) may be used as either a key or a value' ), could be intimidating. If it works, why should it not be used?

Answer 1

The specification says:

 PropertyName : IdentifierName StringLiteral NumericLiteral

and shows that floats are fine in a NumericLiteral .

It's standard. Use it if you want to.