無法訪問JS對象中的值

Question

我想了解更多OO JavaScript。我創造了這樣的事情：

var Player = { 
     player: $('#player'), 
     video: Player.player 
    }; 

    console.log(Player.video); 

console.log回報Uncaught TypeError: Cannot read property 'player' of undefined。我的錯誤在哪裏？

Answer 1

您不能引用一個對象時初始化。 解釋和建議的解決方案發現here！

顯示你可能想是這樣的：

var Player = new function() { 
    this.player = $('#player'); 
    this.video = this.player; 
}; 

console.log(Player.player); 

Answer 2

原因是Player在分配video屬性時尚未定義。

var Player = { 
    player: $('#player'), 
    video: Player.player //<- Player is not defined yet. You are defining it right now. 
}; 

嘗試創建對象之後設置video屬性：

var Player = { 
    player: $('#player')   
}; 
Player.video = Player.player; 

console.log(Player.video);