如何在free jqgrid中将remapColums替换为remapColumnsByName

Question

如何在free jqgrid中将remapColums替换为remapColumnsByName用于保存jqgrid状态。它使用列号保存jqgrid列状态。如果在服务器中更改了jqgrid colmodel，则会在浏览器中导致javascript错误。JQGrid注释中的冻结rownum列和https://github.com/free-jqgrid/jqGrid/blob/master/README49.md描述了方法remapColumnsByName。我希望使用它修复issUe。免费的jqgrid是从今天的git master下载的。在列调整大小或移动行后的状态保存saveColumnState.call($grid, $grid[0].p.remapColumns);被改为saveColumnState.call($grid, $grid[0].p.remapColumnsByName);并在loadComplete代码中恢复状态    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);     }现在排队 if (isColState && myColumnsState.permutation.length > 0 &&导致错误Uncaught TypeError: Cannot read property 'length' of undefined如何修复此问题，以便在更改列定义时可以使用列状态？方法定义为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;     }