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>