如何为angularjs安装cors以访问外部api?

getjson.controller('controller', function($scope, $http){
  var url = "https://api.8coupons.com/v1/getsubcategory"; 

  $http.get(url).success(function(data, status, headers, config){
    $scope.jsondata = data;
    console.log(data);
  }).error(function(data, status, headers, config){});
});
getjson.controller('controller', function($scop