Analysis of MySQL PHP Grammar

Let's first take a look at the basic syntax of the charAt function

Character = str.charAt (index)

The only argument to the charAt function is the index in the string from which a single character is extracted. The range of this index is 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 for this function.

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

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

The code is as follows

Function func () {var str = 'JavaScript is object oriented language'; var value = str.charAt (9); [xss_clean] (value);} func ()

The output is as follows: t

The above content is very simple, thank you for your reading and support.