angularJs在多个控制器中共享服务数据的方法

<div ng-app="module">
 <div ng-controller="ctrl1">
 <table border="1" width="600">
 <tr>
 <td>网站名称</td>
 <td>网址</td>
 </tr>
 <tr ng-repeat="v in data.webs">
 <td>{{v.name}}</td>
 <td>{{v.url}}</td>
 </tr>
 </table>
 </div>
 <hr>
 <div ng-controller="ctrl2">
 <table border="1" width="600">
 <tr>
 <td>网站名称</td>
 <td>网址</td>
 </tr>
 <tr ng-repeat="v in data.webs">
 <td>{{v.name}}</td>
 <td>{{v.url}}</td>
 </tr>
 </table>
 <h1>{{web.name}}</h1>
 <button ng-click="removeAll()">删除所有数据</button>
 </div>
</div>
<script>
 var m = angular.module('module', []);
 //定义服务
 m.factory('videoServer', ['$http', function ($http) {
 var obj = {
 data: {webs:[]},
 //所有数据
 all: function () {
 return $http({url: '1.php'}).then(function (response) {
 obj.data.webs = response.data;
 return obj.data;
 });
 },
 //获取一条数据
 find: function (id) {
 return this.all().then(function (data) {
 for (var i = 0; i < data.length; i++) {
 if (data[i].id == id) {
 return data[i];
 }
 }
 });
 },
 //删除所有数据
 flush: function () {
 obj.data.webs=[];
 }
 };
 return obj;
 }]);
 //控制器ctrl1
 m.controller('ctrl1', ['$scope', 'videoServer', function ($scope, videoServer) {
 videoServer.all().then(function (data) {
 $scope.data = data;
 });
 }]);

 //控制器ctrl2
 m.controller('ctrl2', ['$scope', 'videoServer', function ($scope, videoServer) {
 videoServer.all().then(function (data) {
 $scope.data = data;
 });
 videoServer.find(1).then(function (data) {
 $scope.web = data;
 })
 $scope.removeAll=function(){
 videoServer.flush();
 }
 }]);
</script>

<?php
$data = [
 [ 'name' => '百度', 'url' => 'www.baidu.com' ],
 [ 'name' => '谷歌', 'url' => 'google.com' ],
];
echo json_encode($data,JSON_UNESCAPED_UNICODE);