如何用Javascript将字母转换为数字? [英] How to convert letters to numbers with Javascript?
问题描述
如何在JavaScript中将字母转换为相应的数字?
How could I convert a letter to its corresponding number in JavaScript?
例如:
a = 0
b = 1
c = 2
d = 3
我在将数字转换为超过26个字符字母的字母,但它要求相反。
I found this question on converting numbers to letters beyond the 26 character alphabet, but it is asking for the opposite.
有没有办法在没有庞大阵列的情况下做到这一点?
Is there a way to do this without a huge array?
推荐答案
您可以使用 <从字符串中的任何索引获取代码点* code> String.prototype.charCodeAt 。如果你的字符串是单个字符,你需要索引 0
,而 a
的代码是97(很容易从JavaScript获得'a'.charCodeAt(0)
),所以你可以这样做:
You can get a codepoint* from any index in a string using String.prototype.charCodeAt
. If your string is a single character, you’ll want index 0
, and the code for a
is 97 (easily obtained from JavaScript as 'a'.charCodeAt(0)
), so you can just do:
s.charCodeAt(0) - 97
如果你想要反过来说, String.fromCharCode
获取Unicode代码点*并返回一个字符串。
And in case you wanted to go the other way around, String.fromCharCode
takes Unicode codepoints* and returns a string.
String.fromCharCode(97 + n)
* 不完全
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