Javascript繼承不能使用基類的方法

Question

我試圖使用繼承在JavaScript

我這裏是C＃代碼來顯示我試圖

public class animal 
{ 
    public animal() { } 

    public string move() 
    { 
     return "i'm moving"; 
    } 
    public string bite() 
    { 
     return "just a nip!"; 
    } 
} 

public class snake : animal 
{ 
    public snake() { } 

    public string bite() 
    { 
     return "been poisoned!"; 
    } 
} 

用作什麼：

var a = new animal(); 
var s = new snake(); 

a.bite(); // just a nip 
s.bite(); // been poisoned  

a.move(); // i'm moving 
s.move(); // i'm moving 

現在JS我有：

function animal() { 
}; 

animal.prototype.move = function() { 
    return "im moving"; 
}; 

animal.prototype.bite = function() { 
    return "just a nip"; 
}; 

snake.prototype = new animal(); 
snake.prototype = snake; 

function snake() { 
} 

snake.prototype.bite = function() { 
    return "been poisoned"; 
}; 



var a = new animal(); 
var s = new snake(); 


alert(a.bite()); // just a nip 
alert(s.bite()); // been poisoned 

alert(a.move()); //i'm moving 
alert(s.move()); // s.move is not a function 

我是否必須在每個子類中提供方法並調用基本方法？即添加一個移動方法蛇來調用animal.move？

snake.prototype.move = function() { 
    return animal.prototype.move.call(this); 
} 

Answer 1

現在你設置了原型兩次。

snake.prototype = new animal(); 
snake.prototype = snake; 

第二行應該是

snake.prototype.constructor = snake;