Angularjs 为什么'；工厂更新时，是否更新计算的金额？

我有一个这样简单的工厂

angular.module('posBitcoinApp')
.factory('invoiceData', function ($http, $interval) {

var blockchainInfoExchangeRates = {};

var getLatestExchangeRates = function() {

    $http.get('https://api.bitcoinaverage.com/ticker/global/IDR/')
    .success(function(response) {
        blockchainInfoExchangeRates.IDR = response.last;
    });
};

$interval(getLatestExchangeRates, 60000);
getLatestExchangeRates();

return {
    exchangeRates: blockchainInfoExchangeRates
};

});

然后在我的一个控制器里我有

angular.module('posBitcoinApp')
.controller('InvoiceCtrl', function ($scope, $http, $interval, $location, invoiceData) {

$scope.invoiceData = invoiceData;
$scope.invoiceData.btcAmount = parseFloat($scope.invoiceData.idrAmount / $scope.invoiceData.exchangeRates.IDR).toFixed(8);

因此，汇率每分钟都会更新一次。但是，计算的BTC值（$scope.invoiceData.btcAmount）不会自动更新。我错过了什么？有什么需要注意的吗$scope.apply（）在什么地方

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谢谢。

即使您在factory上刷新数据，也不会在返回数据时反映出来。相反，您必须每隔一分钟刷新scope.invoiceData.btcAmount

Var updateBTC = function(){
//call to factory if you want to avoid having an interval inside factory to update data and use the result in the below statement.
   $scope.invoiceData.btcAmount = parseFloat($scope.invoiceData.idrAmount / $scope.invoiceData.exchangeRates.IDR).toFixed(8);
};

$interval(updateBTC, 60000);

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您的控制器应该监视invoiceData.exchangeRates。