angularJs利用$scope处理升降序的方法

<div ng-app="module" ng-controller="ctrl">
 <table border="1" width="600">
  <tr>
   <td ng-click="orderBy('id')">编号
    <span ng-if="status.id">升序</span>
    <span ng-if="!status.id">降序</span>
   </td>
   <td ng-click="orderBy('click')">点击数
    <span ng-if="status.click">升序</span>
    <span ng-if="!status.click">降序</span>
   </td>
   <td ng-click="orderBy('title')">标题
    <span ng-if="status.title">升序</span>
    <span ng-if="!status.title">降序</span>
   </td>
  </tr>
  <tr ng-repeat="(k,v) in data">
   <td>{{v.id}}</td>
   <td>{{v.click}}</td>
   <td>{{v.title}}</td>
  </tr>
 </table>
</div>
<script>
 var m = angular.module('module', []);
 m.controller('ctrl', ['$scope', '$filter', function ($scope, $filter) {
  $scope.data = [
   {id: 1, click: 100, title: '百度'},
   {id: 2, click: 200, title: '谷歌'},
   {id: 3, click: 300, title: '腾讯'},
  ];
  //记录排序的状态
  $scope.status = {id: false, click: false, title: false};
  $scope.orderBy = function (field) {
   /*切换升序和降序*/
   $scope.status[field]=!$scope.status[field];
   $scope.data = $filter('orderBy')($scope.data, field, $scope.status[field]);
  }
 }]);
</script>