<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<metahttp-equiv="Content-Type"content="text/html; charset=utf-8"/>
<title>复选框（checkbox）全选/全不选/返选</title>
<style>body,dl,dt,dd,p{margin:0;padding:0;}body{font-family:Tahoma;font-size:12px;}label,input,a{vertical-align:middle;}label{padding:0 10px 0 5px;}a{color:#09f;text-decoration:none;}a:hover{color:red;}dl{width:120px;margin:10px auto;padding:10px 5px;border:1px solid #666;border-radius:5px;background:#fafafa;}dt{padding-bottom:10px;border-bottom:1px solid #666;}dt label{font-weight:700;}p{margin-top:10px;}</style>
<scripttype="text/javascript">
window.onload=function(){var oA = document.getElementsByTagName("a")[0];
var oInput = document.getElementsByTagName("input");
var oLabel = document.getElementsByTagName("label")[0];
var isCheckAll = function ()for (var i = 1, n = 0; i < oInput.length; i++)
{oInput[i].checked && n++ }
oInput[0].checked = n == oInput.length - 1;
oLabel.innerHTML = oInput[0].checked ? "全不选" : "全选" }; //全选/全不选
oInput[0].onclick = function () {for (var i = 1; i < oInput.length; i++)
{oInput[i].checked = this.checked }
isCheckAll()}; //反选
oA.onclick = function () {for (var i = 1; i < oInput.length; i++)
{oInput[i].checked = !oInput[i].checked }
isCheckAll()}; //根据复选个数更新全选框状态
for (var i = 1; i < oInput.length; i++) {oInput[i].onclick = function ()
{isCheckAll()}
}
}</script>
</head><body><dl><dt><inputtype="checkbox"id="checkAll"/>
<label>全选</label><ahref="javascript:;">反选</a></dt><dd>
<p><inputtype="checkbox"name="item"/><label>选项（一）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（二）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（三）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（四）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（五）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（六）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（七）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（八）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（九）</label></p>
<p><inputtype="checkbox"name="item"/><label>选项（十）</label></p>
</dd>
</dl>
<center>1、切换全选/全不选文字；2、根据选中个数更新全选框状态；</center></body></html>
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