类型错误:数字不是一个函数

TypeError: number is not a function

本文关键字：一个 函数 错误 数字 类型      更新时间：2023-09-26

我正在开发一个基于文本的游戏，我有一个函数（turn()），可以根据用户按下的按钮来确定用户的动作。

但是每次您按下 3 个按钮之一时，控制台都会说 TypeError: number is not a function .

我已经尝试了许多操作（例如将所有脚本移动到一个文件中，全局定义游戏的变量以及更改函数的顺序），但仍然不起作用！

有什么帮助吗？

JavaScript 代码： 

console.log("Resetting resources...");
var turn = 1;
var player = {
  damage: Math.floor(Math.random() * 4 + 2), //Deals 2 to 5 damage
  healing: Math.floor(Math.random() * 4 + 3), //Heals 3 to 6 health
  health: null,
  maxHP: 25, //Maximum health (not recommended to change)
  special: true,
  alive: true
};
var dragon = {
  damage: Math.floor(Math.random() * 6 + 1), //Deals 1 to 6 damage
  health: null,
  maxHP: 28, //Maximum health (not recommended to change)
  alive: true
};
player.health = player.maxHP;
dragon.health = dragon.maxHP;
console.log("Resources ready!");
function turn() {
  if (player.alive) {
    /*Player turn*/
    console.log("---------------TURN " + turn + " : PLAYER---------------");
    alert("The dragon is still alive!");
    console.log("Player HP: " + player.health + "/" + player.maxHP);
    switch (action) {
      case '1':
        console.log("Dealt " + player.damage + " damage!");
        dragon.health -= player.damage;
        if (dragon.health <= 0) {
          alert("The dragon has been slain!");
          console.log("---------------DRAGON SLAIN---------------");
          dragon.alive = false;
          player.alive = false;
        }
        break;
      case '2':
        console.log("Recovered " + player.healing + " health!");
        player.health += player.healing;
        break;
      case '3':
        alert("Scared of dying, you ditch the scene before you become human toast.");
        console.log("---------------PLAYER SURRENDERS---------------");
        player.alive = false;
        break;
      default:
        console.error("Random error occured.");
        break;
    }
    /*Reset RNG*/
    player.damage = Math.floor(Math.random() * 4 + 2);
    player.healing = Math.floor(Math.random() * 4 + 3);
    /*Dragon turn*/
    console.log("---------------TURN " + turn + " : DRAGON---------------");
    console.log("Dragon HP: " + dragon.health + "/" + dragon.maxHP);
    console.log("Dealt " + dragon.damage + " damage!");
    player.health -= dragon.damage;
    if (player.health <= 0) {
      alert("You have died!");
      console.log("---------------PLAYER DIES---------------");
      player.alive = false;
    }
    /*Reset RNG*/
    dragon.damage = Math.floor(Math.random() * 6 + 1);
    turn++;
  } else if (!player.alive && dragon.alive) {
    alert("You have died!'nGAME OVER'nReset the game to play again.");
  } else if (!dragon.alive) {
    alert("You have slain the dragon!'nGAME OVER'nReset the game to play again.");
  }
}
function attack() {
  turn('1'); //Error occurs here
}
function heal() {
  turn('2'); //and here
}
function flee() {
  turn('3'); // and here
}
<button onclick="attack()">Attack</button>
<button onclick="heal()">Heal</button>
<button onclick="flee()">Flee!</button>

您在脚本开头将turn定义为变量：var turn = 1; 。

然后，您稍后尝试将其重新定义为函数：function turn() { ... } 。

"问题"是 JavaScript 将函数定义放在块的开头，在变量定义之后但在变量赋值之前，所以实际上你的 JavaScript 代码将被解释为：

var turn;
function turn() { ... }
turn = 1;

最终结果实际上是turn是一个数字（1），这不是一个函数，所以你不能用turn('1')调用它。

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