getColumnList () {
            this.loading=true
            util.ajax({
                url: "/crm/conversionAudit/getAttrs",
                method: "get",
                params: {
                    orgId: this.enterpriseId,
                }
            }).then(response => {
               if (response.data.code==1) {
                   this.columnsList = [
                       {
                           title: "Name",
                           key: "name",
                           align: "center",
                           width: 200,
                           fixed: "left",
                           filters: [
                               {
                                   label: "Joe",
                                   value: 1
                               },
                               {
                                   label: "John",
                                   value: 2
                               }
                           ],
                           filterMultiple: false,
                           filterMethod (value, row) {
                               if (value === 1) {
                                   return row.name === "Joe";
                               } else if (value === 2) {
                                   return row.name === "John Brown";
                               }
                           }
                       },
                       {
                           title: "Other",
                           align: "center",
                           children: [
                               {
                                   title: "Age",
                                   key: "age",
                                   align: "center",
                                   width: 200,
                                   sortable: true
                               },
                               {
                                   title: "Address",
                                   align: "center",
                                   children: [
                                       {
                                           title: "Street",
                                           key: "street",
                                           align: "center",
                                           width: 200
                                       },
                                       {
                                           title: "Block",
                                           align: "center",
                                           children: [
                                               {
                                                   title: "Building",
                                                   key: "building",
                                                   align: "center",
                                                   width: 200,
                                                   sortable: true
                                               },
                                               {
                                                   title: "Door No.",
                                                   key: "door",
                                                   align: "center",
                                                   width: 200
                                               }
                                           ]
                                       }
                                   ]
                               }
                           ]
                       },
                       {
                           title: "Company",
                           align: "center",
                           children: [
                               {
                                   title: "Company Address",
                                   key: "caddress",
                                   align: "center",
                                   width: 200
                               },
                               {
                                   title: "Company Name",
                                   key: "cname",
                                   align: "center",
                                   width: 200
                               }
                           ]
                       },
                       {
                           title: "Gender",
                           key: "gender",
                           align: "center",
                           width: 200,
                           fixed: "right"
                       }
                   ]
               }
           })
       }

columns, with header grouping dynamically requested through ajax did not have this problem yesterday, only with a warning: "You may have an infinite update loop in watcher with expression "columns"". The page jammed the next day. The this.columnsList here is originally the data returned by the API. Here, you can directly use the data in iview 3.x

solution: You may have an infinite update loop in watcher with expression" columns "