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JavaScript substr() Method
 Complete String Object Reference
Definition and Usage
The substr() method extracts a specified number of characters in a string,
from a start index.
Syntax
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stringObject.substr(start,length)
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| 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 1
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>
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The output of the code above will be:
Example 2
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>
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The output of the code above will be:
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Complete String Object Reference
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