jQuery_jquery를 기반으로 드롭다운 상자 구현

         $(함수(){
                 $('#add').click(function(){
                var $options = $('#select1 옵션:선택됨');                       $options.appendTo("#select2")
              })
                 $('#remove').click(function(){
                var $options = $('#select2 옵션:선택됨')
                     $options.appendTo("#select1")
              })
                 $('#add_all').click(function(){
                var $options = $('#select1 옵션')
                      $options.appendTo("#select2")
              })
                 $('#remove_all').click(function(){
                var $options = $('#select2 옵션')
                     $options.appendTo("#select1")
              })
                 $('#select1').dblclick(function(){
              var $options = $("option:selected",this) //선택한 옵션 가져오기
                      $options.appendTo('#select2')
              })
                  $('#select2').dblclick(function(){
              var $options = $("option:selected",this) //선택한 옵션 가져오기
                      $options.appendTo('#select1')
              })
         })