這個算是很簡潔了吧？
<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>無標題文檔</title>
</head>
<body>
<ul?id="con">
<li?id="lesson1">javascript
??<ul>?
??????<li?id="tcon">?基礎語法</li>
??????<li>流程控制語句</li>
??????<li>函數</li>
??????<li>事件</li>
??????<li>DOM</li>
??</ul>
</li>
<li?id="lesson2">das</li>
<li?id="lesson3">dadf</li>
<li?id="lesson4">HTML/CSS?
??<ul>
????<li>文字</li>
????<li>段落</li>
????<li>表單</li>
????<li>表格</li>??
??</ul>?
</li></ul>??
<script??type="text/javascript">????
???var?mylist?=?document.getElementById("tcon");?
var?prtNode=mylist.parentNode.parentNoe.parentNode.lastChild;
document.write(prtNode.innerHTML);?
</script>?
</body>
</html>
2020-12-23
你這個輸出的結果不是題目的要求了吧 var?mylist?=?document.getElementById("tcon");? document.write(mylist.parentNode.parentNode.parentNode.lastChild.childNodes[0].nodeValue);