<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<ul id="uu">
<li>我手機(jī)</li>
<li>我手機(jī)</li>
<li>我手機(jī)</li>
</ul>
</body>
<script src="common.js">
</script>
<script type="text/javascript">
function getFirstChild(parent){
if(parent.firstElementChild!=undefined){
return parent.firstElementChild;
}else{//IE8支持的只有firstchid即第一個(gè)節(jié)點(diǎn)
var node=parent.fisrtChild;
if(node&&node.nodetype!=1){//1是元素
node=node.nextSibling;?
}
return
}
}
function getLastChild(parent){
if(parent.lastElementChild!=undefined){
return parent.lastChild;
}else{
var node=node.lastChild;
if(node&&node.nodetype!=1){
node=node.previousSibling;
}
return node;
}
}
console.log(getFirstChild(my$("uu")));
console.log("666");
</script>
</html>
