What is an easy way to call Asc() and Chr() in Jav

问题:

I am not that familiar with Javascript, and am looking for the function that returns the UNICODE value of a character, and given the UNICODE value, returns the string equivalent. I'm sure there is something simple, but I don't see it.

Example:

• ASC("A") = 65
• CHR(65) = "A"
• ASC("ਔ") = 2580
• CHR(2580) = "ਔ"

回答1:

Have a look at:

String.fromCharCode(64)

and

String.charCodeAt(0)

The first must be called on the String class (literally String.fromCharCode...) and will return "@" (for 64). The second should be run on a String instance (e.g., "@@@".charCodeAt...) and returns the Unicode code of the first character (the '0' is a position within the string, you can get the codes for other characters in the string by changing that to another number).

The script snippet:

document.write("Unicode for character ਔ is: " + "ਔ".charCodeAt(0) + "<br />");
document.write("Character 2580 is " + String.fromCharCode(2580) + "<br />");

gives:

Unicode for character ਔ is: 2580
Character 2580 is ਔ

回答2:

Because JavaScript uses UCS-2 internally, String.fromCharCode(codePoint) won’t work for supplementary Unicode characters. If codePoint is 119558 (0x1D306, for the '