代码错在哪里
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>nextSibling</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_previousSibling(n){
var x=n.priviousSibling;
while (x && x.nodeType!=1){
x=x.priviousibling;
}
return x;
}
var x=document.getElementsByTagName("li")[2];
document.write(x.nodeName);
document.write(" = ");
document.write(x.innerHTML);
var y=get_previousSibling(x);
if(y!=null){
document.write("<br />previousSibling: ");
document.write(y.nodeName);
document.write(" = ");
document.write(y.innerHTML);
}else{
document.write("<br>已经是第一个节点");
}
</script>
</body>
</html>
运行结果是：
javascript
jquery
html
css3
php
java
LI = html
已经是第一个节点
******还有，空节点nodeType一定是1吗，那如果不是的话，下面循环的 if(y!=null){}else语句不就没意义了吗
