我想在我的李element.I添加類要上單擊添加類上添加類。當我點擊按鈕時在當前li上添加css類。就像我第一次點擊那麼它第一次活躍。第二點擊之後它在第二李活躍,的jQuery:當前元素
<!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>
幾乎所有可能的重複 – mayersdesign
什麼應該是您的'active'元素?我看不到'.active'或任何代碼 –
單擊按鈕10次會發生什麼? –