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Prototype indexOf() Method
This method returns the position of the first occurrence of the argument within the array. If the argument doesn't exist in the array, returns -1.
NOTE: First index of the Array starts from zero.
Syntax:
Return Value :
Example:
<html>
<head>
<title>Prototype examples</title>
<script type="text/javascript"
src="/javascript/prototype.js">
</script>
<script>
function showResult(){
var arr = [3, 5, 6, 1, 20];
alert("Found position : " + arr.indexOf(6) );
}
</script>
</head>
<body>
<p>Click the button to see the result.</p>
<br />
<br />
<input type="button" value="Result" onclick="showResult();"/>
</body>
</html>
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To understand it in better way you can Try it yourself.
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