html

<ul id="ul1">	<li>9</li>    <li>2</li>    <li>7</li>    <li>4</li>    <li>11</li></ul><input type="button" value="http://www.mamicode.com/排序" id="btn1" />

js代码

window.onload = function(){	var oUl = document.getElementById("ul1");	var oBtn = document.getElementById("btn1");		oBtn.onclick = function(){		var arr = [];		for(var i=0; i<oUl.children.length; i++){			arr.push(oUl.children[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]);		}			}}