JS全选checkbox

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<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);" />
原文地址:https://www.cnblogs.com/findumars/p/3155315.html