錯誤顯示:


除錯顯示:

我比較納悶的是,這跟我的源代碼也不一樣啊??怎么多出來一個ul標簽?
請各位幫我解答一下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>VScode測驗</title>
<link rel="stylesheet" type="text/css" href="https://bbs.csdn.net/topics/easyUI/themes/default/easyui.css">
<link rel="stylesheet" type="text/css" href="https://bbs.csdn.net/topics/easyUI/themes/icon.css">
<script type="text/javascript" src="https://bbs.csdn.net/topics/easyUI/jquery.min.js"></script>
<script type="text/javascript" src="https://bbs.csdn.net/topics/easyUI/jquery.easyui.min.js"></script>
</head>
<body>
<ul id="tree">
<li><span>選單1</span></li>
<li>
<sapn>選單2</sapn>
<ul>
<li><span>選單2-1</span></li>
<li><span>選單2-1</span></li>
<li><span>選單2-1</span></li>
<li><span>選單2-1</span></li>
<li><span>選單2-1</span></li>
<li><span>選單2-1</span></li>
</ul>
</li>
</ul>
<script>
$(function() {
$("#tree").tree();
})
</script>
</body>
</html>
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