如何使用Angular-UI Bootstrap组件实现警报的方法

<div ng-controller="AlertDemoCtrl">
  <alert ng-repeat="alert in alerts" type="alert.type" close="closeAlert($index)">{{alert.msg}}</alert>
  <button class='btn' ng-click="addAlert()">Add Alert</button>
</div>

function AlertDemoCtrl($scope) {
  $scope.alerts = [
    { type: 'error', msg: 'Oh snap! Change a few things up and try submitting again.' }, 
    { type: 'success', msg: 'Well done! You successfully read this important alert message.' }
  ];
  $scope.addAlert = function() {
    $scope.alerts.push({msg: "Another alert!"});
  };
  $scope.closeAlert = function(index) {
    $scope.alerts.splice(index, 1);
  };
}

'use strict';
/* services.js */
// don't forget to declare this service module as a dependency in your main app constructor!
var appServices = angular.module('appApp.services', []);
appServices.factory('alertService', function($rootScope) {
    var alertService = {};
    // create an array of alerts available globally
    $rootScope.alerts = [];
    alertService.add = function(type, msg) {
      $rootScope.alerts.push({'type': type, 'msg': msg});
    };
    alertService.closeAlert = function(index) {
      $rootScope.alerts.splice(index, 1);
    };
    return alertService;
  });

<div>
  <alert ng-repeat="alert in alerts" type="alert.type" close="closeAlert($index)">{{ alert.msg }}</alert>
</div>

function RootCtrl($rootScope, $location, alertService) {
  $rootScope.changeView = function(view) {
    $location.path(view);
  }
  // root binding for alertService
  $rootScope.closeAlert = alertService.closeAlert; 
}
RootCtrl.$inject = ['$scope', '$location', 'alertService'];

function ArbitraryCtrl($scope, alertService) {
  alertService.add("warning", "This is a warning.");
  alertService.add("error", "This is an error!");
}