Javascript console.log返回c（）而不是对象的值

Question

I'm trying to use console.log to get the value of the self.subcategories object after it is created in the subscribe function below. I always get c() in my console from the console.log(self.subcategories) below. I know that the data is there, as I can use it in a different piece of code. I just want to be able to see it in console.log so I can get more info and know what to do with it.

function QuestionFilter(data, categories, getSubcategoriesByCategoryUrl, getQuestionsBySubcategoryUrl) {
  var self = this;
  self.categories = ko.observableArray(categories);
  self.subcategories = ko.observableArray([]);
  self.selectedCategory = ko.observable();

  self.selectedCategory.subscribe(function(category) {
    function search(nameKey, myArray){
      for (var i=0; i < myArray.length; i++) {
        if (myArray[i].parentCategory_id === nameKey) {
          self.subcategories.push(myArray[i]);
        }
      }
    }   
    search(category, categories);
    console.log(self.subcategories);
  });
};

The Knockout.js library is included and so there are a couple of references to it. As I mentioned, everything works, I just want to be able to log the object to help me write more code. Any ideas?

Answer 1

Have a look at the documentation (emphasis mine):

Reading information from an observableArray

Behind the scenes, an observableArray is actually an observable whose value is an array (plus, observableArray adds some additional features described below). So, you can get the underlying JavaScript array by invoking the observableArray as a function with no parameters, just like any other observable. Then you can read information from that underlying array. For example,

 alert('The length of the array is ' + myObservableArray().length); alert('The first element is ' + myObservableArray()[0]);