Javascript charcodeat () and fromcharcode ()

1. charcodeat ()

Convert characters into code;

var str="Hello world!"document.write(str.charCodeAt(1))

1. 'Cjk ': ['u4e00', 'u9fa5'], // Chinese Character [1-Example]
2. 'Num': ['u0030', 'u0039 '], // number [0-9]
3. 'Lal': ['u0061 ', 'u007a'], // lowercase letter [A-Z]
4. 'Ual': ['u0041', 'u005a '], // uppercase letter [A-Z]
5. 'Asc': ['u0020', 'u007e '] // ASCII visual character
   

2. fromcharcode ()

Convert code into characters

Definition and usage

Fromcharcode () accepts a specified Unicode value and returns a string.

Syntax

String.fromCharCode(numX,numX,...,numX)

Parameters	Description
Numx	Required. One or more Unicode values, that is, the Unicode encoding of the characters in the string to be created.

Tips and comments

Note: This method is a static string method. Each character in a string is specified by a separate numeric unicode encoding.

It cannot be used as a string object created by you. Therefore, its syntax should be string. fromcharcode (), rather than mystringobject. fromcharcode ().

Instance

In this example, "hello" and "ABC" are output based on UNICODE ":

<script type="text/javascript">document.write(String.fromCharCode(72,69,76,76,79))document.write("<br />")document.write(String.fromCharCode(65,66,67))</script>

Output of the above Code:

HELLOABC

3. Differences between charcodeat () and charat ()

Charcodeat (I) returns the Unicode encoding of characters at the specified position.

Charat (I) returns the character at the specified position.