为什么自定义可折叠对象在选项卡中无法正常工作？

Question

我正在学习本教程，学习如何使用html、css和一些javascript来制作自己的可折叠文件。到目前为止，我已经用这样的代码得到了我想要的输出：

var question = document.getElementsByClassName("question");
var i;
for (i = 0; i < question.length; i++) {
question[i].addEventListener("click", function() {
this.classList.toggle("active");
var answer = this.nextElementSibling.nextElementSibling;
if (answer.style.maxHeight){
answer.style.maxHeight = null;
} else {
answer.style.maxHeight = answer.scrollHeight + "px";
}
});
}

.faq {
width: 100%
}
.question {
background-color: transparent;
color: #329d9c;
cursor: pointer;
padding: 2% 10%;
width: 100%;
border: none;
text-align: left;
outline: none;
font-size: 18px;
font-weight: 700;
}
.question:after {
content: "276F"; /*up*/
font-size: 20px;
color: black;
float: left;
margin-left: -6%;
font-weight: 700;
transform: rotate(-90deg);
}
.active:after {
content: "276F"; /*down*/
font-size: 20px;
color: black;
float: left;
margin-left: -6%;
font-weight: 700;
transform: rotate(90deg);
}
.line {
width: 90%;
height: 1%;
background-color: #dddddd;
border-radius: 30px;
position: absolute;
margin-left: 10%;
}
.answer {
margin-left: 10%;
padding: 0 6%;
max-height: 0;
overflow: hidden;
transition: max-height 0.2s ease-out;
background-color: white;
box-shadow: 1px 2px #929191;
border: none;
border-radius: 0 0 10px 10px;
color: black;
}

<div class="faq">
<button class="question">Question 1</button>
<div class="line"></div>
<div class="answer">
Answer 1
</div>
<button class="question">Question 2</button>
<div class="line"></div>
<div class="answer">
Answer 2
</div>
</div>

我试着运行相同的代码，并在多个选项卡上进行可折叠，所以它看起来或多或少是这样的：

<div class="tabs">
<div class="tab-1">
<!-- the same code as snippet --!>
</div>
<div class="tab-2">
<!-- the same code as snippet --!>
</div>
</div>

但到目前为止还没有奏效。我尝试使用bootstrap 3来使用手风琴，但它打乱了我的自定义css样式，所以我想知道有什么方法可以解决这个问题吗？

Answer 1

const topic = document.getElementsByClassName('topic');
const topicQS = document.querySelectorAll('.topic');
let topicQSArray = [];
//console.log('keysQS', Object.keys(topicQS));
for (let i = 0; i < topicQS.length; i++) {
topicQS[i].addEventListener('click', function showQuestionQS(e) {
this.classList.toggle('active');
this.nextElementSibling.classList.toggle('show');
let questionsQS = document.querySelectorAll('question');
});
}
const question = document.getElementsByClassName('question');

for (let i = 0; i < question.length; i++) {
question[i].addEventListener('click', function () {
this.classList.toggle('active');
const answer = this.nextElementSibling.nextElementSibling;
if (answer.style.maxHeight) {
answer.style.maxHeight = null;
} else {
answer.style.maxHeight = (20 + answer.scrollHeight) + 'px';
}
});
}

.topic {
background-color: transparent;
color: #329d9c;
cursor: pointer;
padding: 2% 10%;
width: 100%;
border: none;
text-align: left;
outline: none;
font-size: 18px;
font-weight: 700;
}
.topic::after {
content: '276F';
font-size: 20px;
color: black;
float: left;
margin-left: -6%;
font-weight: 700;
transform: rotate(-90deg);
}
.question {
position: relative;
left: 50px;
display: block;
background-color: transparent;
color: #329d9c;
cursor: pointer;
padding: 2% 10%;
width: 100%;
border: none;
text-align: left;
outline: none;
font-size: 18px;
font-weight: 700;
}
.question::after {
content: '276F';
font-size: 20px;
color: black;
float: left;
margin-left: -6%;
font-weight: 700;
transform: rotate(-90deg);
}
.question-container {
/* transition: all ease-in-out 0.3s; */
display: none;
}
.active::after {
content: '276F';
font-size: 20px;
color: black;
float: left;
margin-left: -6%;
font-weight: 700;
transform: rotate(90deg);
}
.line {
width: 90%;
height: 1%;
background-color: #dddddd;
border-radius: 30px;
position: absolute;
margin-left: 10%;
}
.answer {
margin-left: 10%;
margin-top: 1rem;
padding: 0 6%;
max-height: 0;
overflow: auto;
transition: max-height 0.2s ease-in-out;
background-color: white;
box-shadow: 1px 2px #929191;
border: none;
border-radius: 0 0 10px 10px;
color: black;
}
.show {
display: block;
}

<h1>Collapsed Q & A</h1>
<div class="topic1">
<button class="topic">Topic 1</button>
<div class="question-container">
<button class="question">Question 1</button>
<div class="line"></div>
<div class="answer">Answer 1 Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</div>
<button class="question">Question 2</button>
<div class="line"></div>
<div class="answer">Answer 2 Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</div>
<button class="question">Question 3</button>
<div class="line"></div>
<div class="answer">Answer 3 Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</div>
</div>
</div>
<div class="topic2">
<button class="topic">Topic 2</button>
<div class="question-container">
<button class="question">Question 4</button>
<div class="line"></div>
<div class="answer">Answer 4</div>
<button class="question">Question 5</button>
<div class="line"></div>
<div class="answer">Answer 5</div>
<button class="question">Question 6</button>
<div class="line"></div>
<div class="answer">Answer 6</div>
</div>
</div>
<div class="topic3">
<button class="topic">Topic 3</button>
<div class="question-container">
<button class="question">Question 7</button>
<div class="line"></div>
<div class="answer">Answer 7</div>
<button class="question">Question 8</button>
<div class="line"></div>
<div class="answer">Answer 8</div>
<button class="question">Question 9</button>
<div class="line"></div>
<div class="answer">Answer 9</div>
</div>
</div>