str.charAt() in How to use the charAt function is used to return the character at a given string index. Let's take a look at the specific use of the charAt function.
Let’s first take a look at the basic syntax of the charAt function
character = str.charAt（index）
The only parameter of the charAt function is the index in the string. Extract a single character from it. The range of this index is between 0 and length - 1, inclusive. If no index is specified, the first character of the string is returned, since 0 is the default index used for this function.
The function returns a single character located at the index specified as the function argument. If the index is out of range, this function returns an empty string.
Let’s take a look at the specific example of charAt function
The code is as follows
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script>
function func() {
var str = 'How to use the charAt function is object oriented language';
var value = str.charAt(9);
document.write(value);
}
func();
</script>
</body>
</html>The output result is as follows: t
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