您可以使用： Object.keys（card）。length === 0

但请确保从控制器的方法中使用它作为对象在视图中不可用，例如：

But make sure you use it from a method of the controller as the Object is not available in the view, like:

$scope.isObjectEmpty = function(card){
   return Object.keys(card).length === 0;
}

然后你可以从视图中调用该函数：

Then you can call the function from the view:

ng-show="!isObjectEmpty(card)"