//Add data
for (var col = 1; col < 6; col++) {
    for (var row = 2; row < 11; row++) {
        activeSheet.setValue(row, col, row + col);
    }
}

$("#button1").click(function () {
spread.options.allowUndo = true;
var srange = new GC.Spread.Sheets.Range(10, 5, 1, 1);
var frange = new GC.Spread.Sheets.Range(11, 5, 5, 1);
spread.commandManager().execute({cmd: "fill", sheetName: "Sheet1", startRange: srange, fillRange: frange, autoFillType: GC.Spread.Sheets.Fill.AutoFillType.fillSeries, fillDirection: GC.Spread.Sheets.Fill.FillDirection.down });
});

<input type="button" id="button1" value="button1"/>