為什么nodeType輸出不了
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>無標(biāo)題文檔</title>
</head>
<body>
<div id="con">
? <p>javascript</p>
? <div>jQuery</div>
? <h5>PHP</h5>
</div>
<script type="text/javascript">
? var x=document.getElementById("con");
? document.write(x.firstChild.nodeName + "? " + x.firstChild.nodeValue + "? " + x.firstChild.nodeType + "<br>");
? document.write(x.lastChild.nodeName + "? " + x.lastChild.nodeValue + "? " + x.lastChild.nodeType);
?
</script>
</body>
</html>
2020-11-08
我看錯了，不好意思