jq 監聽select 選中值

    
                         <select id="select_id" lay-ignore>
                                <option value="1" selected>Frist Time</option>
                                <option value="2">Second time </option>
                                <option value="3">More</option>
                        </select>

 $(document).ready(function(){
         $("#select_id").change(function(){
             var selected=$(this).children('option:selected').val();
             alert(selected);
             
             if(selected == '1'){
                 $("#form_order1").show();
             }else if(selected == '2'){
                 $("#form_order2").show();
                 $("#form_order1").hide();
             }else if(selected == '3'){
                 $("#form_order2").hide();
                 $("#form_order1").hide();
                 $("#form_order3").show();
             }
             
             

         });
     });