Ember.js如何截獲並傳遞給Ember.Object.create（PARAMS）濾波器參數

Question

App.Person = Ember.Object.extend({ 
    firstName: "Trek", 
}); 

App.person = App.Person.create({ 
    firstName: undefined 
}) 

console.log(App.person.get('firstName')); 

此代碼將輸出不確定，但我想以某種方式攔截的屬性設置，如果它設置爲未定義保持默認值「Trek」不變。

燼-1.0.0

Answer 1

您可以使用計算性能：

App.Person = Ember.Object.extend({ 
    _firstName: 'Trek', 
    firstName: function(key, value) { 
    if (arguments.length > 1 && typeof value !== 'undefined') { 
     this.set('_firstName', value); 
    } 

    return this.get('_firstName'); 
    }.property('_firstName') 
}); 

App.person = App.Person.create({ 
    firstName: undefined 
}) 

console.log(App.person.get('firstName')); 

Answer 2

使用一個計算的屬性和默認值

App.Person = Ember.Object.extend({ 
    firstNameDefault:'Trek', 
    firstName:function(key,value){ 
     if(arguments.length > 1 && typeof value !== 'undefined'){ 
      return value 
     } 
     return this.get('firstNameDefault'); 
    }.property('firstNameDefault') 
}); 

App.person = App.Person.create({ 
    firstName: undefined 
}) 

console.log(App.person.get('firstName'));