Definition and Usage The substr() method extracts a specified number of characters in a string, from a start index. Syntax stringObj...
Definition and Usage
The substr() method extracts a specified number of characters in a string, from a start index.
Syntax
stringObject.substr(start,length) |
Parameter | Description |
start | Required. Where to start the extraction. Must be a numeric value |
length | Optional. How many characters to extract. Must be a numeric value. |
Tips and Notes
Note: To extract characters from the end of the string, use a negative start number (This does not work in IE).
Note: The start index starts at 0.
Note: If the length parameter is omitted, this method extracts to the end of the string.
Example
In this example we will use substr() to extract some characters from a string:
<script type="text/javascript"> var str="Hello world!";
document.write(str.substr(3)); </script> |
The output of the code above will be:
Example
In this example we will use substr() to extract some characters from a string:
<script type="text/javascript"> var str="Hello world!";
document.write(str.substr(3,7)); </script> |
The output of the code above will be: