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>