[英]Javascript inheritance unable to use base class method
I'm trying to use inheritance in javascript 我正在尝试在JavaScript中使用继承
here is example C# code to show what I'm attempting 这是示例C#代码以显示我正在尝试的操作
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!";
}
}
used as: 用作:
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
now in JS I Have: 现在在JS中我有:
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
Do I have to provide a method in each of the subclasses and call the base method? 我是否必须在每个子类中提供一个方法并调用基本方法? ie add a move method to snake to call animal.move?
即添加蛇的移动方法来调用animal.move?
snake.prototype.move = function () {
return animal.prototype.move.call(this);
}
right now you set the prototype twice. 现在,您将原型设置两次。
snake.prototype = new animal();
snake.prototype = snake;
the second line should be 第二行应该是
snake.prototype.constructor = snake;
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