window.onload = function(){
       var spread = new GC.Spread.Sheets.Workbook(document.getElementById("ss"),{sheetCount:3});
       var activeSheet = spread.getActiveSheet();

activeSheet.setRowCount(5);
activeSheet.setColumnCount(2);

    activeSheet.getRange(-1, 1, -1, 1)
    .backColor("lightYellow")
    .width(120);

activeSheet.setValue(0, 0, 10);
activeSheet.setValue(1, 0, 20);
activeSheet.setValue(2, 0, 30);
activeSheet.setValue(3, 0, 40);
activeSheet.setValue(4, 0, 50);

//Set SUM function (Sum of all parameter values).
activeSheet.setFormula(0, 1, "SUM(A1:A5)");
//Set PRODUCT function (Product of all parameter values).
activeSheet.setFormula(1, 1, "PRODUCT(A1:A5)");
//Set AVERAGE function (Average of all parameter values).
activeSheet.setFormula(2, 1, "AVERAGE(A1:A5)");
//Set the sum of cell(0,0) and cell(4,0).
activeSheet.setFormula(3, 1, "A1 + A5");
//Multiply cell(0,0) by 2 if the value in this cell is greater than 10, otherwise multiply it by 3.
activeSheet.setFormula(4, 1, "IF(A1>10, A1*2, A1*3)");
                 }