Javascript 继承不起作用，使用原型方法

如何解决Javascript 继承不起作用，使用原型方法

我搜索了如何继承对象，我发现您可以使用 Create() 函数，但它不起作用。

function Animal(strength,team,id /*url*/ ) {
  this.strength = strength;
  this.team = team;
  this.id = id;
  this.can_move = function(position,destination) {
    this.destination = Board[destination[0]][destination[1]]
    if ((position[0] == destination[0] + 1) && (position[1] == destination[1]) ||
      (position[0] == destination[0] - 1) && (position[1] == destination[1]) ||
      (position[1] == destination[1] + 1) && (position[0] == destination[0]) ||
      (position[1] == destination[1] - 1) && (position[0] == destination[0])) {} else {
      console.log('false')
      return false
    }

    if (Board[destination[0]][destination[1]].animal != null) {
      if (this.can_eat(Board[destination[0]][destination[1]].animal)) {
        /*pass*/ } else {
        console.log('false')
        return false
      }
    }
    if (!this.obstacle()) {
      return false;
    }

    console.log('true')
    return true
  }
  this.can_eat = function(animal) {
    if (animal.strength <= this.strength) {
      return true
    } else {
      return false
    }
  }
  this.obstacle = function() {
    if (Board[destination[0]][destination[1]].type == "River1" || Board[destination[0]][destination[1]].type == "River2" ||
      Board[destination[0]][destination[1]].type == team + "_goal") {
      console.log("false");
      return false;
    }
  }
  this.move = function(position,destination) {
    //pass
  }
}

function Mouse(team,id) {

}
Mouse.prototype = Object.create(Animal.prototype);

Board 是一个数组，如果我做一个新鼠标，它不知道 can_move 是什么：

Uncaught TypeError: Board[2][6].animal.can_move is not a function,animal is just an 
attribute of board,it contains Mouse.

编辑：谢谢，但现在它给了我：

Cannot set property 'can_move' of undefined
at new Animal.

解决方法

您需要确保在 Animal

的原型上声明您的函数

function Animal(){

}
Animal.prototype.can_move = function(){ return true; }

function Mouse(){

}
Mouse.prototype = Object.create(Animal.prototype);

const m = new Mouse();
console.log(m.can_move());

使用类更容易

class Animal {
   can_move(){ return true; }
}

class Mouse extends Animal {}

const m = new Mouse();
console.log(m.can_move());