<div ng-controller="ctrl">        <div>{{ 100 | myCurrency}}</div>        <div ng-click="change1(‘SGD‘)">change</div>             </div>                  angular.module("Main", dependentModuleList).                    controller("ctrl", function ($scope, currencyService) {                        $scope.change1 = function (code) {                            currencyService.changeCodeTo(code);                        };                    });  

  angular.module("Currency", []).        provider("currencyService", [function () {            var that = this;            this.defaultCode = "USD"; //允许通过provider修改            this.$get = ["$rootScope", function ($rootScope) {                var COOKIE_KEY = "currecyCode";                var SERVICE_PATH = "//service.stooges.com.my/currency.ashx?defaultCode=" + that.defaultCode; //这里可以请求一个当前的 rate table (来自 http://www.xe.com/currencytables)                var defaultCode = that.defaultCode;                var currentCode = G.s.Cookie.get(COOKIE_KEY) || defaultCode;                var rateColletion = {}; //{USD:3.1538542348}                var ajaxing = false;                function getRateFromServer() {                                      ajaxing = true;                    G.s.fn.jsonp(SERVICE_PATH).then(function (response) {                                               ajaxing = false;                        rateColletion = JSON.parse(response).data;                                                $rootScope.$digest(); //手动渲染                                        }, function () {                        console.log("get currency rate table fail !");                    });                }                function getMoneyFormat(money, code) {                    return code + " " + (parseFloat(money).toFixed(2));                }                return {                    changeCodeTo: function (code) {                                                currentCode = code; //请在外部digest                        G.s.Cookie.set(COOKIE_KEY, currentCode, new Date().addMonths(1));                                            },                    convertMoney: function (money) {                                             if (defaultCode === currentCode || ajaxing) {  //正在向服务器请求的话也直接返回                                                   return getMoneyFormat(money, currentCode);                         }                                              var rate = rateColletion[currentCode];                        if (rate != undefined) {                                                       return getMoneyFormat(money / rate, currentCode); //这里是用除法                        }                        else {                                                      getRateFromServer(); //第一次得向服务器请求rate表格                            return getMoneyFormat(money, currentCode);                        }                    }                }            }]        }]).        filter("myCurrency", ["$rootScope", "currencyService", function ($rootScope, currencyService) {            //手动调用的话要注意, 如果没有rate,会直接返回原value            return function (money) {                                return currencyService.convertMoney(money);            }        }]);