用JavaScript实现两种功能：1、切换全选/全不选文字；2、根据选中个数更新全选框状态；（实例代码来自view-source:http://www.fgm.cc/learn/lesson2/12

关于反选和统计选中个数的问题解决我还不太懂，有待进一步学习和理解：

	<!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>
	<meta http-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>
	<script type="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><input type="checkbox" id="checkAll" /><label>全选</label><a href="javascript:;">反选</a></dt>
	<dd>
	<p><input type="checkbox" name="item" /><label>选项（一）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（二）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（三）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（四）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（五）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（六）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（七）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（八）</label></p>
	<p><input type="checkbox" name="item" /><label>选项（九）</label></p>
	<p><input type="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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