Prototype include () Method

Syntax:

string.include(substring);

Return Value:

Returns a boolean value. If it finds subsrting then it returns true otherwise false.

Example:

<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript" 
   src="/javascript/prototype.js">
</script>
<script>

function showResult(){

  var str = 'Prototype framework';
  
  alert( "First Check :" + str.include('framework' ) );
  alert( "Second Check :" + str.include('No framework' ) );

}

</script>
</head>

<body>

  <p>Click the button to see the result.</p>
  <br />
  <br />
  <input type="button" value="Result" onclick="showResult();"/>

</body>
</html>

To understand it in better way you can Try it yourself.