如何在JavaScript中将上标数字转换为实数

Question

How can you transform a string containing a superscript to normal string?

For example I have a string containing "n⁵" . I would like to transform it to "n5" . For the string "n⁵" , i am not using any <sup></sup> tags. It is exactly like you see it.

Answer 1

To replace each character, you can assemble all the superscript characters in an ordered string (so that ⁰ is at index 0, ¹ is at index 1, etc.) and get their corresponding digit by indexOf :

function digitFromSuperscript(superChar) {
    var result = "⁰¹²³⁴⁵⁶⁷⁸⁹".indexOf(superChar);
    if(result > -1) { return result; }
    else { return superChar; }
}

You can then run each character in your string through this function. For example, you can do so by a replace callback:

"n⁵".replace(/./g, digitFromSuperscript)

Or more optimally, limit the replace to only consider superscript characters:

"n⁵".replace(/[⁰¹²³⁴⁵⁶⁷⁸⁹]/g, digitFromSuperscript)

Answer 2

Nothing fancy: you can replace the ⁵ character with the 5 character.

 var result = "n⁵".replace("⁵", "5"); console.log(result); 

Answer 3

You can use regex replacement with a replacement function:

 function replaceSupers(str) { var superMap = { '⁰': '0', '¹': '1', '²': '2', '³': '3', '⁴': '4', '⁵': '5', '⁶': '6', '⁷': '7', '⁸': '8', '⁹': '9' } return str.replace(/[⁰¹²³⁴⁵⁶⁷⁸⁹]/g, function(match) { return superMap[match]; }); } console.log(replaceSupers('a¹²n⁴⁵lala⁷⁸⁹'));