window.onload = function(){
        var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
        var activeSheet = spread.getActiveSheet();
     // セルの背景色と前景色を設定します。
    var cell = activeSheet.getCell(1, 1, GC.Spread.Sheets.SheetArea.viewport);
      cell.backColor("Blue");
      cell.foreColor("Red");
      cell.value("Color");
                       }