我正在制作一个基于文本的RPG，您可以在每个屏幕上说“是”或“否”，我需要帮助删除事件侦听器

Question

所以，我有一个函数可以检查你是否按下了"n"或"y"，当你按下"n"时，一个数字攻击你，之后它应该删除事件侦听器，然后给你一个赢得战斗的机会，但在此之前有一个屏幕说按任意键继续，但该屏幕没有显示。帮助？

我已经为此工作了一段时间，它只是不起作用，它不会删除事件侦听器。

这是开始屏幕代码，在命名你的角色和东西之后

document.body.innerHTML = "<h4>As you are walking to the bar at a pub, a dark, hooded figure, pulls you aside to a corner: 'Listen, I have a job for you...'</h4><h2>Press 'Y' to accept, and 'N' to turn back to the bar</h2><img id='hoodedFigure' src='https://render.fineartamerica.com/images/rendered/default/print/6.125/8.000/break/images-medium/the-hooded-figure-kayleigh-semeniuk.jpg'>";

然后添加事件侦听器：

var event1 = window.addEventListener("keydown", checkKeyPressed, false);

这是它调用的函数：

        {if (evt.keyCode == "89") {
        changeContentOnPressY(1);
    } if (evt.keyCode == "78") {
changeContentOnPressN(1);
    }}}```
//Then it calls this function to change the screen:
```function changeContentOnPressN(num) {
        if (num == 1) {
    window.removeEventListener("keydown", checkKeyPressed, false);
    document.body.innerHTML = "The strange figure draws his weapons and agresses on you. You draw your small blade, and attempt to slash his stomach.<h3 style='text-align:center;'>Press any key to continue...</h3>";
            window.addEventListener("keydown", chance(1), false);
        } if(num == 2) {
window.addEventListener("keydown", checkKeyPressed2, false);
document.body.innerHTML = ""; // for 2nd n path}}```
//This is the part that is not working:
```window.removeEventListener("keydown", checkKeyPressed, false);```
This is the chance() function:
```function chance(num) {
    if (num == 1) {
        var chance = Math.random(0.1, 1);
 if (chance >= 0.80) {
 document.body.innerHTML = "Suddenly a swaggering figure walks towards you he says intrduces himself as Jean-Jacques le Tourment des Ombres, Grand Connoisseur of the Ombres House, he says 'You made the right choice, he was not to be trusted. I too dont like the Sabbath Family. Together we can get revenge'. Press Y to accept and N top refuse";
 } else {
 document.body.innerHTML = "He quickly slits your right wrist, and collects the blood spilled in a barrel. Soon nobles will enjoy this aged red. <br> <h1 style='text-align:center;'>GAME OVER<h1><br><h3 style='text-align:center;'>Press any key to continue...</h3>";
 window.addEventListener("keydown", startGame1, false);}}}}```

Answer 1

你的问题发生了很多事情，我将专注于我认为跳过的屏幕。据我所知，它应该删除事件侦听器。

在你的代码中，你有这个段，它应该等待玩家按任意键。

window.addEventListener("keydown", chance(1), false);

问题是你立即调用"机会"函数，而不是等待。

如果您希望能够再次取消绑定该函数，您可以

function waitForChance() {
    chance(1)
}
window.addEventListener("keydown", waitForChance, false);

然后你可以稍后解绑它

window.removeEventListener("keydown", waitForChance, false);

顺便说一句，如果我是你，我可能会尽量避免取消绑定和重新绑定事件侦听器，因为它容易出错(并且难以阅读(。我可能会创建一个这样的状态系统，您可以在其中创建对象并在它们之间切换。我认为它更清楚地说明了哪些功能属于哪个状态。

// every state has 2 properties text and options
// text is what is displayed on the screen
// options contain the functions that are executed when the user presses a key
// if you want to bind a specific just bind enter that key in lower case
// if you want to accept any key add a function on anyKey 
//---------------- STATES --------------------------
let startState = {
  text: `<h4>As you are walking to the bar at a pub, a dark, hooded figure, pulls you aside to a corner: 'Listen, I have a job for you...'</h4><h2>Press 'Y' to accept, and 'N' to turn back to the bar</h2><img id='hoodedFigure' src='https://render.fineartamerica.com/images/rendered/default/print/6.125/8.000/break/images-medium/the-hooded-figure-kayleigh-semeniuk.jpg'>`,
  options: {
    y: function() {
      loadState(takeDealState)
    },
    n: function() {
      loadState(ambushState)
    }
  }
}
let takeDealState = {
  text: `What ever happend when you take the deal  (for now i reload the game on anykey)`,
  options: {
    /*Your options when you take the deal for now I just reset the game*/
    anyKey: function() {
      loadState(startState)
    }
  }
}
let ambushState = {
  text: `The strange figure draws his weapons and agresses on you. You draw your small blade, and attempt to slash his stomach.<h3 style='text-align:center;'>Press any key to continue...</h3>`,
  options: {
    anyKey: function() {
      var chance = Math.random(0.1, 1)
       if (chance >= 0.80) {
        loadState(successfullAmbush)
       } else {
        loadState(failedAmbush)
       }
    }
  }
}
let successfullAmbush = {
  text: `Suddenly a swaggering figure walks towards you he says intrduces himself as Jean-Jacques le Tourment des Ombres, Grand Connoisseur of the Ombres House, he says 'You made the right choice, he was not to be trusted. I too dont like the Sabbath Family. Together we can get revenge'. Press Y to accept and N top refuse`,
  options: {
    y: function() {
      console.log("accept")
    },
    n: function() {
      console.log("decline")
    }
  }
}
let failedAmbush = {
  text: `He quickly slits your right wrist, and collects the blood spilled in a barrel. Soon nobles will enjoy this aged red. <br> <h1 style='text-align:center;'>GAME OVER<h1><br><h3 style='text-align:center;'>Press any key to continue...</h3>`,
  options: {
    anyKey: function() {
      loadState(startState)
    }
  }
}
///---------------- LOGIC show and handle keypresses ---------------------------------- 
let currentState;
function loadState(state) {
  // set the state as the current state, so it can 
  currentState = state;
  // let the state descibe the scene
  document.body.innerHTML = state.text;
}
function keyHandler(event) {
  if(currentState.options.anyKey) {
    // handle anykey
    currentState.options.anyKey(event.key)
  } else if(currentState.options[event.key]) {
    // handle other key presses such as y/n
    currentState.options[event.key](event.key)
  }
}
window.addEventListener("keypress", keyHandler, true)
// start the game
loadState(startState)