Analysis of MySQL PHP Grammar

2021-11-13 18:36:52
OfStack

Let's first look at the basic syntax of charAt function under 1

character = str. charAt (index)

The only 1 argument to the charAt function is index in the string, from which a single character is extracted. This index ranges between 0 and length-1, including restrictions. If no index is specified, the first character of the string is returned because 0 is the default index used for this function.

The function returns a single character at the index specified as the function parameter. If the index is out of range, this function returns an empty string.

Let's take a look at a concrete example of the charAt function

The code is as follows


<!DOCTYPE html>
<html>
<head>
 <title></title>
</head>
<body>
<script> 
function func() { 
  var str = 'JavaScript is object oriented language'; 
  
  var value = str.charAt(9); 
  document.write(value);  
} 
func(); 
</script>  
</body>
</html>

The output is as follows: t

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