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String.prototype.indexOf() Method in String Class of Javascript Syntax with Examples
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Usage 
indexOf() returns the position of element from the elements.
Syntax 
String.indexof("element",startingPosition)

By default - starting position is -1 , if the position not defined.
Example
var userName = "Prasanna";

//The counting of element position start from -1 up to finding the first 'a' element.
var char1 = userName.indexOf("a");
document.write("The element position is "+char1+" in the string.");

//The counting of element position start from 2 that is count 2 + Actual count(2) of the element 'n'.
var char2 = userName.indexOf("a",2);
document.write("The element position is "+char2+" in the string.");
Output 
The element position is 2 in the string.
The element position is 4 in the string.
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