（Angularjs Javascript）变量赋值

Question

即时新手，我有问题。我使用promise angularjs编写简单的代码。

var data = {"collection": "installation", 
       "timeframe": { 
          "start": moment(date_from).format('YYYY-MM-DDTHH:mm:ss'), 
          "end": moment(date_to).format('YYYY-MM-DDTHH:mm:ss') 
       }}; 
    var install_all = Insight.installations(data); 
    data['filters'] = [{"property_name": "os", "operator": "eq", "property_value": "android"}]; 
    var filter_android = data; 
    var install_android = Insight.installations(filter_android); 
    data['filters'][0]['property_value'] = 'ios'; 
    var filter_ios = data; 
    var install_ios = Insight.installations(filter_ios); 
    data['filters'][0]['property_value'] = 'windowsphone'; 
    var filter_wp = data; 
    var install_windowsphone = Insight.installations(filter_wp); 
    $q.all({'install_all': install_all, 'install_android':install_android, 
    'install_ios':install_ios,'install_windowsphone':install_windowsphone}) 
    .then(function(data){ 
     $scope.install_all = data['install_all']['result']; 
     $scope.install_android = data['install_android']['result']; 
     $scope.install_ios = data['install_ios']['result']; 
     $scope.install_windowsphone = data['install_windowsphone']['result']; 

    }, function(errors){ 
     console.log("The request failed with response" + errors.status); 
    }); 

我希望当我运行，脚本调用4个API不同的过滤器。但是当我检查控制台日志，所有api相同的过滤器是这样的：

{u'filters': [{u'operator': u'eq', u'property_name': u'os', u'property_value': u'windowsphone'}], u'collection': u'installation', u'timeframe': {u'start': u'2015-07-04T00:00:00', u'end': u'2015-07-04T00:00:00'}} 
"POST /admin/api/queries/count HTTP/1.1" 200 - 

为什么变量相同？我不明白。对不起，我的英语

Answer 1

您正在覆盖data过滤器。你总是修改同一个对象。 Filter-ios，filter-android，filter-wp是对同一对象的引用。在修改之前，您需要制作副本。