angularJs自定义过滤器实现手机号信息隐藏的方法

<div ng-app="module" ng-controller="ctrl">
 <table border="1" width="600">
  <tr>
   <td>编号</td>
   <td>姓名</td>
   <td>手机号</td>
  </tr>
  <tr ng-repeat="(k,v) in data">
   <td>{{v.id}}</td>
   <td>{{v.name}}</td>
   <td>{{v.mobile|truncate:4}}</td>
  </tr>
 </table>
</div>
<script>
 var m = angular.module('module', []);
/自定义过滤器truncate/
 m.filter('truncate',function(){
  return function(mobile,len){
   len = len?len:3;
   return mobile.substr(0,11-len)+new String('').repeat(len);
  }
 });
 m.controller('ctrl', ['$scope', '$filter', function ($scope, $filter) {
  $scope.data = [
   {id: 1, name: '张三', mobile: '14567654445'},
   {id: 2, name: '李四', mobile: '13910959565'},
   {id: 3, name: '王五', mobile: '13232343425'},
  ];
 }]);
</script>