Problems encountered: Use a script to get the current mouse-selected rows and repeat them.

I used a dumb way to duplicate rows 1 and 2.
Couldn't this be done with just one function?

It would be easier if you could make a judgment based on the rows selected by the mouse.

Please guide me.

//dub header 
var cell = app.activeDocument.selection[0].parent
var myTable = cell.parent
firstRow = myTable.rows[0];
//duplicat row1
if (firstRow.rowType !== RowTypes.HEADER_ROW)
	{
	dupeTopRow(myTable);
	/**
* duplicate the first row af a myTable 
* @ param the myTable 
* @ return void 
*/
function dupeTopRow(t){
    var newRow = t.rows.add(LocationOptions.BEFORE, t.rows[0]);//past here
    var newCell = newRow.cells
    var lr = t.rows[1].cells//copy which row
    for (var i = 0; i < newCell.length; i++){
		newCell[i].properties = lr[i].properties;
    };   
}

//dublicat row2
dupeTopRow2(myTable);
function dupeTopRow2(b){
    var newRow2 = b.rows.add(LocationOptions.BEFORE, b.rows[1]);//past here
    var newCell2 = newRow2.cells
    var nr = b.rows[3].cells//copy which row
    for (var j = 0; j < newCell2.length; j++){
		newCell2[j].properties = nr[j].properties;
    };   
}


}
else{
alert("header exist")
exit ();
}

OK, I've checked the original code - you haven't read first line of Peter's reply:

"This works: select an an insertion point in any cell, then do this:"

But your selection is bunch of Cells.

Too many parents:

var cell = app.selection[0].parent.parentRow.cells[0];

First "parent" - gets you the Table - so you need to drop it, because Table doesn't have "parentRow":

var cell = app.selection[0].parentRow.cells[0];

But then - you still have a problem:

And if you want to ping Peter - you need to make a space before "@".