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JS實現ul,li排序效果

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<!DOCTYPE html>
<html>
<head>
    <title>js列表排序</title>
    <meta charset="utf-8">
</head>    
<style type="text/css">
    
</style>
<script type="text/javascript">
        window.onload=function(){
             var oUl=document.getElementById(
ul1); var oBtn=document.getElementById(btn1); oBtn.onclick=function(){ var aLi=document.getElementsByTagName(li); var arr=[]; for(var i=0;i<aLi.length;i++){ arr[i]=aLi[i]; } arr.sort(
function(li1,li2){ var n1=parseInt(li1.innerHTML); var n2=parseInt(li2.innerHTML); return n1-n2; }); for(var i=0;i<arr.length;i++){ oUl.appendChild(arr[i]); } } }
</script> <body> <input type="button" id="btn1" value="排序" /> <hr /> <ul id="ul1"> <li>32</li> <li>25</li> <li>3</li> <li>18</li> </body> </html>

JS實現ul,li排序效果