我想在我的李element.I添加类要上单击添加类上添加类。当我点击按钮时在当前li上添加css类。就像我第一次点击那么它第一次活跃。第二点击之后它在第二李活跃,的jQuery:当前元素
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("li:first").addClass("intro");
});
});
</script>
<style>
.intro {
font-size: 150%;
color: red;
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<li>This is a heading</li>
<li>This is a heading</li>
<li>This is a heading</li>
<li>This is a heading</li>
<li>This is a heading</li>
<li>This is a heading</li>
<li>This is a heading</li>
<li>This is a heading</li>
<button>Add a class name to the first p element</button>
</body>
</html>
几乎所有可能的重复 – mayersdesign
什么应该是您的'active'元素?我看不到'.active'或任何代码 –
单击按钮10次会发生什么? –