我想把下面获取到的textarea的值传入到下拉框里面 可是不知道这个代码错在哪里了，请前辈指导

                                <select class="selectpicker getcol" name="ceshi">
                                    <option >choice one</option>
                                </select>



                                <script>
                                    $(function(){
                                        $(".selectpicker").selectpicker({
                                            width : 300, 
                                            multiple:"false"
                                        })
                                    })
                                </script>




                                <script>
                                    $(function(){
                                        $(".getcol").click(function(){
                                            
                                            $(this).empty();
                                            var text=$('#data_matrix').val();
                                            var allcon=text.split("\n");
                                            var firstcol=allcon[0].split("\t");
                                            //console.log(firstcol);
                                            
                                            var count = firstcol.length;
                                            var collist="";
                                            for(var i=0;i<count;i++){
                                                collist +='<option value="'+firstcol[i]+'">'+firstcol[i]+'</option>';
                                            }
                                            $(this).append(collist);
                                            $(this).selectpicker('refresh');
                                        })
                                    })
                                </script>