flexgrid 怎么通过代码触发字段排序和取消字段排序

flexgrid 怎么通过代码触发字段排序和取消字段排序

请参考下面的代码

1. // expose data as a CollectionView to get events
   
2.   $scope.data = new wijmo.collections.CollectionView(data);
   
3.   $scope.data.sortDescriptions.push(new wijmo.collections.SortDescription('sales','true'));
   
4. 
   
5.   
   
6.   $scope.sort = function() {
   
7.           $scope.data.sortDescriptions.clear();
   
8.     $scope.data.sortDescriptions.push(new wijmo.collections.SortDescription('country','true'));

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1. //create CollectionView
   
2.   var cv = new wijmo.collections.CollectionView(data);
   
3.   //add the column to be sorted by creating an object of SortDescription
   
4.   // we are sorting country column in ascending order
   
5.   cv.sortDescriptions.push(new wijmo.collections.SortDescription("country", 'true'));
   
6.   //set the datasource
   
7.   grid.itemsSource = cv;

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