@Override
		public void removeUpdate(DocumentEvent e) {
			//System.out.println("Document remove event");
			try {
				// ΪɾӰĵ, ԳȾͲҪ
				colouring((StyledDocument) e.getDocument(), e.getOffset(), 0);
			} catch (BadLocationException e1) {
				e1.printStackTrace();
			}
		}