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# DOMCharacterData->substringData()

DOMCharacterData->substringData() -- Extracts a range of data from the node

## Description

class DOMCharacterData {
string substringData ( int offset, int count )
}

Returns the specified substring.

## Parameters

offset

  Start offset of substring to extract.

count

  The number of characters to extract.

## Return Values

The specified substring. If the sum of offset and count exceeds the length, then all 16-bit units to the end of the data are returned.

## Exceptions

`DOM_INDEX_SIZE_ERR`

  Raised if offset is negative or greater than the number of 16-bit units in data, or if count is negative.

## 參考

DOMCharacterData->appendData()
DOMCharacterData->deleteData()
DOMCharacterData->insertData()
DOMCharacterData->replaceData()

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