Usage examples of js charAt_javascript skills

eg:

Copy code The code is as follows:

Result:

The first character is: H
The second character is: e
The third character is: l

Definition and usage

charAt( ) method returns the character at the specified position.

Note that JavaScript does not have a character data type distinct from the string type, so the characters returned are strings of length 1.

Syntax

stringObject.charAt(index)

Parameter Description

index Required. A number that represents a certain position in a string, that is, the subscript of a character in the string.

Tips and Notes

Note: The index of the first character in the string is 0. If the parameter index is not between 0 and string.length, this method returns an empty string.

Example

In the string "Hello world!", we will return the character at position 1:

Copy code The code is as follows:

The output of the above code is:

e

Return the specified The character at index position.

strObj.charAt(index)

Parameters

strObj

Required. Any String object or literal.

index

Required. The zero-based index of the desired character. Valid values ​​are between 0 and the string length minus 1.

Description

The charAt method returns a character value that is located at the specified index position. The first character in the string has index 0, the second has index 1, and so on. Index values ​​outside the valid range return an empty string.

Example

The following example illustrates the use of the charAt method:

Copy code Code As follows:

function charAtTest(n){
var str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // Initialize variables.
var s; // Declare variables.
s = str.charAt(n - 1); // Get the correct character from index n - 1
//
return(s); //Return characters.
}