无法访问JS对象中的值

Question

我想了解更多OO JavaScript。我创造了这样的事情：

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

    console.log(Player.video); 

console.log回报Uncaught TypeError: Cannot read property 'player' of undefined。我的错误在哪里？

Answer 1

您不能引用一个对象时初始化。 解释和建议的解决方案发现here！

显示你可能想是这样的：

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属性时尚未定义。

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

尝试创建对象之后设置video属性：

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

console.log(Player.video);