<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.111cn.net/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<title>javascript选择当前页面所有checkbox 复选框代码</title>
<script language="javascript">
function selectalls(state)
{
var inputs = document.getElementsByTagName("input"); for(var i=0; i< inputs.length; i++)
{
if(inputs[i].type == "checkbox")
{
inputs[i].checked =state;
}
}
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<input type="checkbox" name="checkbox1" id="c1" />
<input type="checkbox" name="checkbox2" id="c2" />
<label for="checkbox"></label>
<input type="text" name="textfield" id="textfield" />
<input type="submit" name="button" id="button" value="按钮" onclick="javascript:selectalls(true);" />
</form>
<label for="textfield"></label>
<input type="button" name="button" id="button" value="按钮" onclick="javascript:selectalls(true);" /> </body>
</html>

前后两个按钮都可以。参考:
http://www.cnblogs.com/star250/archive/2007/10/31/944206.html

radio特殊一些,因为同名的radio有两个按钮,但又只能单选,所以必须根据它的value才能判断是哪一个(value不代表被选中):

function selectalls(state)
{
var inputs = document.getElementsByTagName("input"); for(var i=0; i< inputs.length; i++)
{
// if (i<=7) alert(inputs[i].name + " " + inputs[i].value + " "+ inputs[i].checked);
if ((inputs[i].type == "radio") && (inputs[i].value=='true'))
{
inputs[i].checked = state;
}
}
}
<input type="button" name="button" id="button" value="<?php echo $ini_array['index.select.all']?>" onclick="javascript:selectalls(true);" />
05-11 20:29