我只是在 HTML 中插入了一段非常简单的 JavaScript，虽然它根本不起作用，但我检查了几次但找不到问题所在。
我插入的 JavaScript 添加了展开/折叠功能。当我将 HTML、CSS 和 JS 分别粘贴到 StackOverflow 的代码板中时，它运行良好，但当我将它们放在一起时，JS 部分就无法工作。
提前致谢!
<!DOCTYPE html>
<html>
<head>
<script>
$('.accordionOm').next().hide();
$(".opened").next().show();
$('.accordionOm').click(function() {
if ($(this).hasClass("opened") == true) {
$(this).next().slideUp("slow");
$(this).removeClass('opened');
} else {
$(".opened").next().slideUp("slow");
$(".opened").removeClass("opened");
$(this).addClass('opened');
$(this).next().slideDown("slow");
}
});
</script>
</head>
<style type="text/css">
.accordionOm {
position: relative;
padding: 10px 0 10px 30px;
margin: 0;
font: 300 18px 'Oswald', Arial, Helvetica, sans-serif;
cursor: pointer;
}
.accordionOm:hover {
color: #000;
}
.accordionOm:before,
.accordionOm:after {
content: "";
position: absolute;
background: #333;
display: inline-block;
}
.accordionOm:before {
width: 20px;
height: 2px;
left: 0;
top: 22px;
}
.accordionOm:after {
width: 2px;
height: 20px;
left: 9px;
top: 13px;
transition: transform .5s;
transform: rotate(0);
}
.accordionOm.opened:after {
transform: rotate(90deg);
}
.accordionOm + div {
border-left: 4px solid #999;
padding: 0 15px;
margin-left: 8px;
font: 13px 'Open Sans', Arial, Helvetica, sans-serif;
color: #666;
}
</style>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h4 class="accordionOm opened">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
<h4 class="accordionOm">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
<h4 class="accordionOm">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
<h4 class="accordionOm">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
</body>
</html>最佳答案
将脚本放在引用 jQuery 的标记下方。由于它是从上到下执行的，因此当您的脚本运行时浏览器尚未加载 jQuery，因此不会发生任何事情。
<!DOCTYPE html>
<html>
<head>
</head>
<style type="text/css">
.accordionOm {
position: relative;
padding: 10px 0 10px 30px;
margin: 0;
font: 300 18px 'Oswald', Arial, Helvetica, sans-serif;
cursor: pointer;
}
.accordionOm:hover {
color: #000;
}
.accordionOm:before,
.accordionOm:after {
content: "";
position: absolute;
background: #333;
display: inline-block;
}
.accordionOm:before {
width: 20px;
height: 2px;
left: 0;
top: 22px;
}
.accordionOm:after {
width: 2px;
height: 20px;
left: 9px;
top: 13px;
transition: transform .5s;
transform: rotate(0);
}
.accordionOm.opened:after {
transform: rotate(90deg);
}
.accordionOm + div {
border-left: 4px solid #999;
padding: 0 15px;
margin-left: 8px;
font: 13px 'Open Sans', Arial, Helvetica, sans-serif;
color: #666;
}
</style>
<body>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h4 class="accordionOm opened">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
<h4 class="accordionOm">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
<h4 class="accordionOm">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
<h4 class="accordionOm">Accordian heading</h4>
<div>
<p>Lorem ipsum dolor sit amet, adipiscing elit. Nullam dignissim convallis est. Quisque aliquam. Donec faucibus. Nunc iaculis suscipit dui. Nam sit amet sem. Aliquam libero nisi, imperdiet at, tincidunt nec, gravida vehicula, nisl. Praesent mattis, massa
quis luctus fermentum, turpis mi volutpat justo, eu volutpat enim diam eget metus.</p>
</div>
</body>
<script>
$('.accordionOm').next().hide();
$(".opened").next().show();
$('.accordionOm').click(function() {
if ($(this).hasClass("opened") == true) {
$(this).next().slideUp("slow");
$(this).removeClass('opened');
} else {
$(".opened").next().slideUp("slow");
$(".opened").removeClass("opened");
$(this).addClass('opened');
$(this).next().slideDown("slow");
}
});
</script>
</html>关于javascript - 插入的js根本不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33491131/