我正在制作一个猜字游戏，我在底部有一个记分牌，显示玩家在输掉游戏之前已经离开了多少生命。我有一个屏幕键盘，用户点击它来选择他们想要猜的字母。
一切正常，除了移除玩家的“生命”。我将生命视为有序列表中的图像。在每次单击按钮时，函数会检查按钮按下是否与短语中的字母匹配。如果没有，则需要从有序列表中删除生命，并将错过的计数加1。
将错过的计数添加1可以在按下每个错误的按钮时起作用，但是移除心脏仅适用于每个其他按钮，我不知道为什么。任何帮助将不胜感激。
function checkLetter(clickedButton) {
const letters = document.getElementsByClassName('letter');
let letterFound = null;
for (let i = 0; i < letters.length; i += 1) {
if (clickedButton === letters[i].textContent) {
letters[i].classList.add('show');
letterFound = true;
}
}
return letterFound;
}
function changeScore() {
let scoreboardList = document.querySelector('ol');
scoreboardList.removeChild(scoreboardList.childNodes[0]);
}
qwerty.addEventListener('click', (e) => {
const button = e.target;
const buttonText = button.textContent;
checkLetter(buttonText);
if (checkLetter(buttonText) == null) {
missed += 1;
changeScore();
console.log(missed);
} else {
button.classList.add('chosen');
}
});
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Wheel of Success!</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="css/styles.css" rel="stylesheet">
</head>
<body>
<div class="main-container">
<div id="overlay" class="start">
<h2 class="title">Wheel of Success</h2>
<a class="btn__reset">Start Game</a>
</div>
<div id="banner" class="section">
<h2 class="header">Wheel of Success</h2>
</div>
<div id="phrase" class="section">
<ul></ul>
</div>
<div id="qwerty" class="section">
<div class="keyrow">
<button>q</button><button>w</button><button>e</button><button>r</button><button>t</button><button>y</button><button>u</button><button>i</button><button>o</button><button>p</button>
</div>
<div class="keyrow">
<button>a</button><button>s</button><button>d</button><button>f</button><button>g</button><button>h</button><button>j</button><button>k</button><button>l</button>
</div>
<div class="keyrow">
<button>z</button><button>x</button><button>c</button><button>v</button><button>b</button><button>n</button><button>m</button>
</div>
</div>
<div id="scoreboard" class="section">
<ol>
<li class="tries"><img src="images/liveHeart.png" height="35px" width="30px"></li>
<li class="tries"><img src="images/liveHeart.png" height="35px" width="30px"></li>
<li class="tries"><img src="images/liveHeart.png" height="35px" width="30px"></li>
<li class="tries"><img src="images/liveHeart.png" height="35px" width="30px"></li>
<li class="tries"><img src="images/liveHeart.png" height="35px" width="30px"></li>
</ol>
</div>
</div>
<script type="text/javascript" src="js/app.js"></script>
</body>
</html>据我所知，您对scoreboardList.removeChild(scoreboardList.childNodes[0]);的调用将删除第一个节点。在您的情况下，这不一定是元素，但也可以是仅包含空格的文本节点。这可能是原因，为什么只有每一次调用看起来都在做某事。另一个是删除空白区域。我已经更改了代码以显式删除第一个“心脏”节点。当然，刘易斯在评论中提到：不要两次打电话给checkLetter。只需在if中直接使用它。
let missed = 0;
function changeScore() {
let scoreboardList = document.querySelector('ol');
// !!!!!! These two lines are the important changes:
let heart = scoreboardList.querySelector('li:first-child'); // find first heart item
scoreboardList.removeChild(heart); // remove the heart
}
document.addEventListener('click', (e) => {
//const button = e.target;
//const buttonText = button.textContent;
//if (checkLetter(buttonText) == null) {
missed += 1;
changeScore();
console.log(missed);
//} else {
// button.classList.add('chosen');
//}
});<div id="scoreboard" class="section">
<ol>
<li class="tries"><img src="http://pngimg.com/uploads/heart/heart_PNG51341.png" height="35px" width="30px"></li>
<li class="tries"><img src="http://pngimg.com/uploads/heart/heart_PNG51341.png" height="35px" width="30px"></li>
<li class="tries"><img src="http://pngimg.com/uploads/heart/heart_PNG51341.png" height="35px" width="30px"></li>
<li class="tries"><img src="http://pngimg.com/uploads/heart/heart_PNG51341.png" height="35px" width="30px"></li>
<li class="tries"><img src="http://pngimg.com/uploads/heart/heart_PNG51341.png" height="35px" width="30px"></li>
</ol>
</div>只需像这样更新你的changeScore()方法：
function changeScore() {
let scoreboardList = document.querySelector('ol');
// Replace this
// scoreboardList.removeChild(scoreboardList.childNodes[0]);
// By this 'EDIT'
scoreboardList.removeChild(scoreboardList.querySelector('li:first-child'));
}
每次答案都是假的，那就会消除一颗心。