實測可用的代碼
<!DOCTYPE?HTML>
<html>
<head>
??<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
??<title>無標題文檔</title>
</head>
<body>
??<div?id="content">
????<h1>html</h1>
????<h1>php</h1>
????<h1>javascript</h1>
????<h1>jquery</h1>
????<h1>java</h1>
??</div>
??<script?type="text/javascript">
????function?clearText()?{
??????//?在此完成該函數
??????var?content?=?document.getElementById("content");
??????var?length?=?content.childNodes.length;
??????for?(let?i?=?0;?i?<?length;?i++)
????????content.removeChild(content.childNodes[0]);
????}
??</script>
??<button?onclick="clearText()">清除節點內容</button>
</body>
</html>
