Definition and Usage The indexOf() method returns the position of the first occurrence of a specified string value in a string. Syntax ...
Definition and Usage
The indexOf() method returns the position of the first occurrence of a specified string value in a string.
Syntax
stringObject.indexOf(searchvalue,fromindex) |
| Parameter | Description |
| searchvalue | Required. Specifies a string value to search for |
| fromindex | Optional. Specifies where to start the search |
Tips and Notes
Note: The indexOf() method is case sensitive!
Note: This method returns -1 if the string value to search for never occurs.
Example
In this example we will do different searches within a "Hello world!" string:
<script type="text/javascript"> var str="Hello world!";
document.write(str.indexOf("Hello") + "<br />");
document.write(str.indexOf("World") + "<br />");
document.write(str.indexOf("world"));</script> |
The output of the code above will be:
