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<html>
<head>
<title>soft</title>
<script type="text/javascript">
function topOne(){
var lis = document.getElementById('form1').getElementsByTagName('li');
for(var i=0,len = lis.length;i<len;i++){
if(lis[i].innerHTML.indexOf('checked') != -1){
if(i!=0){
var t = lis[i-1].innerHTML;
var s = lis[i].innerHTML;
lis[i-1].innerHTML = s;
lis[i].innerHTML = t;
}else{
alert('已经在最顶端')
}
}
}
}
</script>
</head>
<body>
<form id="form1">
<div>
<input type="button" value="顶" onClick="top()">
<input type="button" value="上" onClick="topOne()">
<input type="button" value="下" >
<input type="button" value="底" onClick="bottom()">
</div>
<div>
<ul>
<li><input type="radio" name="sel" value=""> <input type="text" value="1"></li>
<li><input type="radio" name="sel" value=""> <input type="text" value="2"></li>
<li><input type="radio" name="sel" value=""> <input type="text" value="3"></li>
<li><input type="radio" checked name="sel" value=""> <input type="text" value="4"></li>
<li><input type="radio" name="sel" value=""> <input type="text" value="5"></li>
<li><input type="radio" name="sel" value=""> <input type="text" value="6"></li>
<li><input type="radio" name="sel" value=""> <input type="text" value="7"></li>
<li><input type="radio" name="sel" value=""> <input type="text" value="8"></li>
</ul>
</div>
</form>
</body>
</html>