如何在free jqgrid中將remapColums替換為remapColumnsByName用于保存jqgrid狀態。它使用列號保存jqgrid列狀態。如果在服務器中更改了jqgrid colmodel，則會在瀏覽器中導致javascript錯誤。JQGrid注釋中的凍結rownum列和https://github.com/free-jqgrid/jqGrid/blob/master/README49.md描述了方法remapColumnsByName。我希望使用它修復issUe。免費的jqgrid是從今天的git master下載的。在列調整大小或移動行后的狀態保存saveColumnState.call($grid, $grid[0].p.remapColumns);被改為saveColumnState.call($grid, $grid[0].p.remapColumnsByName);并在loadComplete代碼中恢復狀態    if (isColState && myColumnsState.permutation.length > 0 &&                       myColumnsState.permutation.length === cm.length) {         $grid.jqGrid("remapColumns", myColumnsState.permutation, true);     }同    if (isColState && myColumnsState.permutation.length > 0 &&                       myColumnsState.permutation.length === cm.length) {         $grid.jqGrid("remapColumnsByName", myColumnsState.permutation, true);     }現在排隊 if (isColState && myColumnsState.permutation.length > 0 &&導致錯誤Uncaught TypeError: Cannot read property 'length' of undefined如何修復此問題，以便在更改列定義時可以使用列狀態？方法定義為var saveColumnState = function (perm) {     var colModel = this.jqGrid('getGridParam', 'colModel'),         i, l = colModel.length, colItem, cmName,         postData = this.jqGrid('getGridParam', 'postData'),         columnsState = {             search: this.jqGrid('getGridParam', 'search'),             page: this.jqGrid('getGridParam', 'page'),             rowNum: this.jqGrid('getGridParam', 'rowNum'),             sortname: this.jqGrid('getGridParam', 'sortname'),             sortorder: this.jqGrid('getGridParam', 'sortorder'),             autoedit: autoedit,             rownumbers: $grid.jqGrid('getGridParam', 'rownumbers') && !$grid[0].p.colModel[0].hidden,             searchWindow: searchParams,             editWindow: editParams,             permutation: perm,             selectedRows: idsOfSelectedRows,             colStates: {}         },         colStates = columnsState.colStates;     if (typeof (postData.filters) !== 'undefined') {         columnsState.filters = postData.filters;     }