How To Use String Object indexOf In Java Script

In this article I am going to explain about String Object indexOf In JavaScript.
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Use indexOf() method in JavaScript

The indexOf() method find the position of string value from the given character sets. 

The indexOf() method returns -1 if the value to search for never occurs.

This method is case sensitive.

All browsers support string object indexOf() method.

Syntax

string.indexOf(searchvalue,start)

Example

<!DOCTYPE html>

<html>

<body style ="background-color:Red">

 

<p id="demo">String a specifed value occurs.</p>

 

<button onclick="myFunction()">Click here</button>

 

<script type="text/javascript">

    function myFunction() {

        var str = "Hi welcome JavaScript.";

        var n = str.indexOf("welcome");

        document.getElementById("demo").innerHTML = n;

    }

</script>

 

</body>

</html>

Output1

 op1.jpg

Output2

 op2.jpg

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