javascript - 如何覆盖现有的 Backbone 模型方法保持其他方法相同

Question

我有一个 Backbone 模型，我无权编辑。所以我想修改它的方法，这样其他方法的功能就不会受到影响。

ShoppingDetail = Backbone.Model.extend({
   className: 'CartID',
   fetch: function() {},
   checkForChanges: function() {},
   newCoupon: function() {},
   saveAndallow: function() {}
 });

 shoppingDetailModel = new ShoppingDetail();
 shoppingCartView = new ShoppingCartView({
   model: shoppingDetailModel
 });

所以我想覆盖模型的 saveAndallow 方法。我怎样才能在不影响该模型的其他方法的情况下做到这一点

Answer 1

为什么不创建一个新模型来扩展您的 ShoppingDetail 模型？

ShoppingDetail = Backbone.Model.extend({ 
    className: 'CartID', 
    fetch: function() {},
    checkForChanges : function() {},
    newCoupon: function(){},
    saveAndallow: function(){}
});

NewShoppingDetail = ShoppingDetail.extend({
    saveAndallow: function(){};
});

shoppingDetailModel = new NewShoppingDetail();
shoppingCartView =  new ShoppingCartView({
        model : shoppingDetailModel
});

所以现在，当你调用任何方法时，它会首先检查它是否在 NewShoppingDetail 中可用，如果不可用，然后它会检查 ShoppingDetail。