<input type="button" id="button1" value="button1"/>
var namedStyle = new GC.Spread.Sheets.Style();
namedStyle.name = "style1";
namedStyle.backColor = "green";
spread.addNamedStyle(namedStyle);
activeSheet.setStyleName(1, 1, "style1"); // cell(1,1)'s backColor is green.
activeSheet.setStyleName(2, 1, "style1");
var style = spread.getNamedStyle("style1");
style.foreColor = "red"; // the namedStyle's foreColor is red.
activeSheet.repaint(); // the foreColor of the cell(1,1) and cell(2,1) is red.
activeSheet.getCell(1,1).value("test");
$("#button1").click(function () {
spread.removeNamedStyle("style1");
});