修改设施类型切换的bug

ruoyi-admin/src/main/resources/templates/system/facilities/add.html

@@ -85,6 +85,7 @@
                     type: "get",
                     dataType: "json",
                     success: function(data){
+                        $("#ff").empty();
                         for(var i=0; i<data.length; i++){
                             $("#ff").append("<input id=\"facilities\" name=\"facilities\" type=\"checkbox\" value=\"" + data[i].id +"\">"+data[i].facilitiesName+"</input>");
                         }