How do I save data into excel using PHP javascript

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PHP

Hi Friends, I have html form when I click submit button .data should be moved to a excel sheet Again if I entered one more data in html form that should be appended in excel not replace !! below is the my html file in ...please help me out. I dont no how to do in javascript plz help me

What I have tried:


function mytest1()
{

var ExcelApp = new ActiveXObject("Excel.Application");
var ExcelSheet = new ActiveXObject("Excel.Sheet");
// a text is stored in the first cell

ExcelSheet.ActiveSheet.Cells(1,1).Value = "textarea1";
ExcelSheet.ActiveSheet.Cells(1,2).Value = "textarea2";

// the sheet is saved
ExcelSheet.SaveAs("C:\\Users\\s\\Desktop\\TEST.xlsx");
// close Excel with the Quit() method of the Application object
ExcelSheet.Application.Quit();

}