在angularJS中实现返回前一页

1. html  
2.   <script src="lib/angular/angular-1.4.9/angular.js"></script>  
3.   <script src="lib/angular/angular-ui-router.min.js"></script>  
4. app  
5.     angular.module('ConsoleUIApp', ['ui.router','ui.bootstrap'])  
6.         .config(function ($stateProvider, $urlRouterProvider, $httpProvider) {  
7.   
8.             // For any unmatched url, redirect to /state1  
9.             $urlRouterProvider.otherwise("/home");  
10.   
11.             $stateProvider  
12.                 .state('home', {  
13.                     url: "/home",  
14.                     templateUrl: "views/home.html",  
15.                     controller: 'HomeCtrl'  
16.                 })  
17.                 .state('testing', {  
18.                     url: "/testing",  
19.                     templateUrl: "views/testing.html",  
20.                     controller: 'TestingCtrl'  
21.                 })  
22.         })  
23.   
24.         .run(function($rootScope, growl, $state, $stateParams) {  
25.             $rootScope.$state = $state;  
26.             $rootScope.$stateParams = $stateParams;  
27.             $rootScope.$on("$stateChangeSuccess",  function(event, toState, toParams, fromState, fromParams) {  
28.                 // to be used for back button //won't work when page is reloaded.  
29.                 $rootScope.previousState_name = fromState.name;  
30.                 $rootScope.previousState_params = fromParams;  
31.             });  
32.             //back button function called from back button's ng-click="back()"  
33.             $rootScope.back = function() {//实现返回的函数  
34.                 $state.go($rootScope.previousState_name,$rootScope.previousState_params);  
35.             };  
36.         });  
37. controller：  
38.     $scope.sub = function(addRode) {  
39.     $rootScope.back()//直接使用  
40.     }