Walkthrough of JavaScript charCodeAt Method (Unicode encoding for obtaining a specified location character) _ Basics

JavaScript charCodeAt method

The charCodeAt method is used to get the Unicode encoding of the specified position character from the string. The syntax is as follows:

Copy Code code as follows:

Str_object.charcodeat (x)

Parameter description:

Parameters	Description
Str_object	The string to manipulate (object)
X	Necessary. A number that represents a location

Tip: The string is counted starting from 0.

charCodeAt Method Instance

Copy Code code as follows:

<script language= "JavaScript" >
document.write ("jb51". charCodeAt (1));
</script>

Run the example and output:

Copy Code code as follows:

98

If the parameter x is not between 0 and the maximum length of the string, the method returns NaN.

The charCodeAt method is very similar to the CharAt method, except that the former returns the encoding of the character at the specified position, which returns a string of characters subcode.