对AngularJS中的多个列进行排序时，显示空值始终在最后

app.controller('myController', function($scope) {
  $scope.items = [
    { name: 'John', age: 25 },
    { name: 'Alice', age: null },
    { name: 'Bob', age: 30 },
    { name: 'Eve', age: null }
  ];

  $scope.customSort = function(item) {
    if (item.age === null) {
      return Number.MAX_VALUE; // 将空值排在最后
    }
    return item.age;
  };
});

<table>
  <tr>
    <th>Name</th>
    <th>Age</th>
  </tr>
  <tr ng-repeat="item in items | orderBy:customSort">
    <td>{{ item.name }}</td>
    <td>{{ item.age }}</td>
  </tr>
</table>