abstract：<!DOCTYPE html><html><head> <title></title> <script type="text/javascript" src="jquery-3.3.1.min.js"></script> <style type="text/c
<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript" src="jquery-3.3.1.min.js"></script>
<style type="text/css">
.box{color: red;}
.main{font-size: 40px;font-weight: bold;}
</style>
</head>
<body>
<p title="ok">php中文网</p>
<script type="text/javascript">
$(document).ready(function () {
$('p').addClass('box main')
$('p').removeClass('box main')
$('p').attr('id','wrong')
alert( $('p').attr('id'))
alert(%('p').text)
})
</script>
</body>
</html>
老师我来提高的，帮我审核通过下