activeSheet.getRange(0, -1, 1, -1).backColor("Red");
activeSheet.setValue(0, 0, "value");
activeSheet.addRows(0, 1);

$("#button1").click(function () {

             var insertRows = activeSheet.getInsertRows();
            var len = insertRows.length;
            for(var i = 0; i < len; i++){
                var r = insertRows[i];
             alert("rowIndex:" + r.row);       
}        
   });

// Add button control to page
<input type="button" id="button1" value="button1"/>