Node Style Property
Node supports the background color, gradient, border, and font color and the like style properties. It may be set via Node#setStyle().
For more information, please refer to style list
Example
Set the color and gap of node border
var style = graph.createNode("Style Node", 100, 0);
style.setStyle(Q.Styles.BORDER, 1);
style.setStyle(Q.Styles.BORDER_COLOR, '#AABBEE');
style.setStyle(Q.Styles.PADDING, 5);
Operation effect: