emberjs - 財產火災兩次

Question

爲什麼此代碼中的「fullName」函數執行兩次？

Person = Ember.Object.extend({ 
    // these will be supplied by `create` 
    firstName: null, 
    lastName: null, 
    fullName: function() { 
    console.log('Full name function...'); 
    var firstName = this.get('firstName'); 
    var lastName = this.get('lastName'); 
    return firstName + ' ' + lastName; 
    }.property('firstName', 'lastName') 
}); 

App.tom = Person.create({ 
    firstName: "Tom", 
    lastName: "Dale" 
}); 

App.UsersView = Ember.View.create({ 
    templateName: 'users', 
    users: [App.tom] 
}); 

在谷歌鉻控制檯後來：

App.tom.set('firstName', 'John') 

此輸出登錄兩次。

Answer 1

似乎是一個錯誤，確實是（增加了的jsfiddle來說明：http://jsfiddle.net/MikeAski/GRvgt/）...

的觀點被重新描繪，和計算性能尚未緩存。 :-(