如何解决CORS即angularjs同源策略

我开发的angularjs，我必须作出调用Web服务的移动应用程序。但是，当我正在与 $ http.get 电话这是给下面的错误。

I am developing a mobile application in angularjs where I have to make call to web service. But, when I am making the call with $http.get it is giving the following error.

XMLHttpRequest cannot load http://example.com/First_Step.json. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8020' is therefore not allowed access. 

我给这家功能如下：

My function for this is as follows:

$scope.firstStepClick = function() {
    appSvc.selectedItem = "firstStep";
    $rootScope.go('parent/firststep', 'slideLeft');
    delete $http.defaults.headers.common['X-Requested-With'];            
    $http.get("http://example.com/First_Step.json").success(function(data) {
        $scope.firstStepData = data;
    }).error(function() {
        alert("an unexpected error occured");
    });
};

所以，请帮我解决这个问题CORS。我使用HTML5，CSS3和angularjs这个移动应用程序开发。

So, please help me to solve this CORS problem. I am using html5, css3 and angularjs for this mobile app development.

在此先感谢