enter键回车绑定多个事件

   $(function(){

        document.onkeydown = function(e){
            if(!e){
             e = window.event;
            }
            if((e.keyCode || e.which) == 13){
               if($("#add_school_dialog").attr("style")!=undefined){
                   if($("#add_school_dialog").is(":visible")){
                       $("#add_schol_button").click();
                    } 
               }
              if($("#register_dialog").attr("style")!=undefined){
                   if($("#register_dialog").is(":visible")){
                    $("#register_dialog_button").click();
                    } 
               }
              if($("#55dc111ce0f4eace").attr("style")!=undefined){
                  if($("#55dc111ce0f4eace").is(":visible")){
                     $("#55dc111ce0f4eace").find(".btn-default").click();
                      } 
               }
            }
           }
    })