Question

我正在尝试学习后端语言和前端语言。最近，我一直在努力实施Derek Banas＆＃39; ＆＃34; OOPGame [C＃教程第8号]＆＃34;在JavaScript中。但是，代码返回＆＃39; GetAttackResult未定义＆＃39;当我使用节点解释器运行它时。

我该如何解决？

这是我的代码：

class Warrior
{
    constructor(name, health)
    {
        this.name = name;
        this.health = health;
    }

    Attack()
    {
        let attackValue = Math.round(Math.random * 50);
        return attackValue;
    } 

    Block()
    {
        let blockValue = Math.round(Math.random * 10);
        return blockValue;
    }
}

class Battle
{

    StartFight(warrior1 , warrior2)
    {
        while (true)
        {
            if (GetAttackResult(warrior1, warrior2) == "Game Over")
            {
               console.log("Game Over");
               break;
            }

            if (GetAttackResult(warrior2, warrior1) == "Game Over")
            {
                console.log("Game Over");
                break;
            }
        }
    }
    GetAttackResult(warriorA, warriorB)
    {    
        let warA_attack = warriorA.Attack();
        let warB_block = warriorB.Block();

        let dmg2warB = warA_attack - warB_block;
        warriorB.health = warriorB.health - dmg2warB;

        if (dmg2warB > 0)
        {
            console.log(`${warriorA.name} attacks ${warriorB.name} and deals ${dmg2warB} damage.`);
            console.log(`${warriorB.name} has ${warriorB.health} health.\n`);

            if (warriorB.health <= 0)
            {
                console.log(`${warriorB.name} has died and ${warriorA.name} is victorius`);
                return "Game Over";
            }
            else return "Fight Again!";
        }
     }
 }

Main();
function Main()
{
    let apple = new Warrior("Apple", 3000);
    let microsoft = new Warrior("Microsoft", 3000);

    let hi = new Battle();
    hi.StartFight(apple, microsoft);
}

运行它的输出：

[Running] node "i:\JSPractise\tempCodeRunnerFile.js"
i:\JSPractise\tempCodeRunnerFile.js:4
    let apple = new Warrior("Apple", 3000);
                ^

ReferenceError: Warrior is not defined
    at Main (i:\JSPractise\tempCodeRunnerFile.js:4:17)
    at Object.<anonymous> (i:\JSPractise\tempCodeRunnerFile.js:1:63)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:188:16)
    at bootstrap_node.js:609:3

[Done] exited with code=1 in 0.42 seconds

注意：我正在学习“Eloquent JavaScript”中的JS＆＃39;书，我密切关注它。另外，我使用＆＃39; Main（）＆＃39;定义入口点b＆＃39;因为我来自C / C ++背景，我发现它很方便。

Answer 1

在您的代码中，GetAttackResult是方法。这意味着您可以将其作为通过new Battle创建的实例的属性进行访问（通常为this）。它不是一个独立的功能。

例如（见评论）：

StartFight(warrior1 , warrior2)
{
    while (true)
    {
        if (this.GetAttackResult(warrior1, warrior2) == "Game Over")
        //  ^^^^^
        {
           console.log("Game Over");
           break;
        }

        if (this.GetAttackResult(warrior2, warrior1) == "Game Over")
        //  ^^^^^
        {
            console.log("Game Over");
            break;
        }
    }
}

某些语言允许您离开this.对字段和方法（Java，C＃）的引用。 JavaScript没有。

Node.js解释器返回Function Not Defined

1 个答案: