                        課程
                    
                        /前端開發
                        
                            /JavaScript
                        
                        /JavaScript進階篇

JS中nodetype跟nodeType有什么不同嗎？

<!DOCTYPE?html>
<html>
<head>
??<meta?charset="UTF-8">
??<meta?name="viewport"?content="width=device-width,?initial-scale=1.0">
??<meta?http-equiv="X-UA-Compatible"?content="ie=edge">
??<title>Document</title>

</head>
<body>
<ul?id="u1">
??<li?id="a">javascript</li>
??<li?id="b">jquery</li>
??<li?id="c">html</li>
</ul>
<ul?id="u2">
??<li?id="d">css3</li>
??<li?id="e">php</li>
??<li?id="f">java</li>
</ul>
??<script?type="text/javascript">
????function?get_nextSibling(n)?{
??????var?x=n.nextSibling;
??????while?(x?&&?x.nodeType!=1)?{
????????x=x.nextSibling;
??????}
??????return?x;
????}

????var?x=document.getElementsByTagName('li')[0];
????document.write(x.nodeName);
????document.write('?=?');
????document.write(x.innerHTML);

????var?y=get_nextSibling(x);

????if?(y!=null)?{
??????document.write('<br?/>nextSibling:');
??????document.write(y.nodeName);
??????document.write('?=?');
??????document.write(y.innerHTML);
????}
????else?{
??????document.write('<br?/>已經是最后一個節點');
????}
??//get_previousSibling
??function?get_previousSibling(n)?{
????var?m=n.previousSibling;
????while?(m?&&?m.nodeType!=1)?{
??????m=m.previousSibling;
????}
????return?m
??}

????var?m=document.getElementById('b');
????document.write('<br?/>'+m.nodeName);
????document.write('?=?');
????document.write(m.innerHTML);

????var?h=get_previousSibling(m);

????if?(h!=null)?{
??????document.write('<br?/>previousSibling:');
??????document.write(h.nodeName);
??????document.write('?=?');
??????document.write(h.innerHTML);
????}
????else?{
??????document.write('<br?/>已經是最前的一個節點');
????}
??</script>
</body>
</html>

nodetype跟nodeType有什么不同嗎？

在這代碼中，如果把nodeType改成nodetype，運行結果就不一樣了。

麻煩高手解答！