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分享这种CSS的写法表示的是什么意思？
如下的HTML代码
<!DOCTYPE html>
<html>
<head>
<style>
span.fot { color: red; font-size: 120%; font-style: italic; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div>
<span>Corey,</span>
<span>Yehuda,</span>
<span>Adam,</span>
<span>Todd</span>
</div>
<div>
<b>Nobody,</b>
<span>Jörn,</span>
<span>Scott,</span>
<span>Timo</span>
</div>
<script>
$("span:first-of-type").addClass("fot");
</script>
</body>
</html>
这里面的span.fot 是什么意思？表示class? id ? tag?
<!DOCTYPE html>
<html>
<head>
<style>
span.fot { color: red; font-size: 120%; font-style: italic; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div>
<span>Corey,</span>
<span>Yehuda,</span>
<span>Adam,</span>
<span>Todd</span>
</div>
<div>
<b>Nobody,</b>
<span>Jörn,</span>
<span>Scott,</span>
<span>Timo</span>
</div>
<script>
$("span:first-of-type").addClass("fot");
</script>
</body>
</html>
这里面的span.fot 是什么意思？表示class? id ? tag?
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