abstrait：<!DOCTYPE html><html><head> <meta charset="utf-8"> <title>jquert</title> <script type="text/javascript" src="D:/链接/jquery.h
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>jquert</title>
<script type="text/javascript" src="D:/链接/jquery.html/jquery-3.3.1.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready(function(){
$("div").hide()
$("button").click(function(){
$("div").show()
})
})
</script>
<div style="width: 100px;height: 100px;background: pink;"></div>
<button>电击</button>
</body>
</html>
Professeur correcteur：天蓬老师Temps de correction：2019-02-13 13:25:33
Résumé du professeur：你确信这是三级 下拉菜单?