如何从该模型的实例调用静态 Backbone.Model 函数，而不指定模型名称？

发布于 2024-11-17 23:06:17 字数 599 浏览 5 评论 0原文

我想从 Backbone.Model 对象的实例访问静态属性。我知道我可以对父构造函数进行硬编码来调用该方法，但这会阻止我拥有多态静态函数。例如，如果需要，我希望能够覆盖 ExtendedInventory 中的 foo 函数，而无需更改任何其他代码。

var Inventory = Backbone.Model.extend({},
    //STATIC
    {
        foo: function() {
            alert('bar');
        }
    });

var i = new Inventory({});
i.constructor.foo(); //This works!

var ExtendedInventory = Inventory.extend({});

var ei = new ExtendedInventory({});
ei.constructor.foo(); //THIS DOES NOT WORK


//How do I generically access the `Inventory.foo()` function via the `ei` object. I would

原文

I have static properties that I would like to access from instances of my Backbone.Model objects. I know I could hardcode the parent constructor to call the method, but this prevents me from having polymorphic static functions. For example, I would like to be able to override the foo function in ExtendedInventory if necessary, without having to change any other code.

var Inventory = Backbone.Model.extend({},
    //STATIC
    {
        foo: function() {
            alert('bar');
        }
    });

var i = new Inventory({});
i.constructor.foo(); //This works!

var ExtendedInventory = Inventory.extend({});

var ei = new ExtendedInventory({});
ei.constructor.foo(); //THIS DOES NOT WORK


//How do I generically access the `Inventory.foo()` function via the `ei` object. I would

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恰似旧人归 2024-11-24 23:06:17

唔。尽管上面的代码确实有效，但我不会就这样。如果该函数在逻辑上可以通过类的对象访问，则在基类中定义一个调用该类/“静态”函数的实例方法。我认为这使得代码更干净、更清晰（另外，客户不必记住有些晦涩的语法）：

var Inventory = Backbone.Model.extend({
    foo: function() {
        this.constructor.foo();
    }
}, {
    foo: function() {
        alert('bar');
    }
});

var i = new Inventory({});
i.foo(); //This works!

var ExtendedInventory = Inventory.extend({});

var ei = new ExtendedInventory({});
ei.foo();

Hmm. Though the code above does work, I wouldn't leave it that way. If the function is logically accessible through an object of the class, then define an instance method in the base class that calls the class/"static" function. This makes the code cleaner and clearer, I think (plus, clients don't have to remember the somewhat arcane syntax):

var Inventory = Backbone.Model.extend({
    foo: function() {
        this.constructor.foo();
    }
}, {
    foo: function() {
        alert('bar');
    }
});

var i = new Inventory({});
i.foo(); //This works!

var ExtendedInventory = Inventory.extend({});

var ei = new ExtendedInventory({});
ei.foo();

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