如何在javascript获得表单中单选按钮的值

[feifei5217319]

如何在javascript获得表单中单选按钮的值并判断选择的是哪一个，请大家帮帮忙，谢谢

[hch126163]

getElementById
getElementsByName
getElementsByTagName

判断 checked 属性

[挨踢直男]

<form onsubmit='return check()'>
<input type='checkbox' name='cb'/>
<input type='checkbox' name='cb'/>
<input type='checkbox' name='cb'/>
<input type='checkbox' name='cb'/>
<input type='checkbox' name='cb'/>
<input type='checkbox' name='cb'/>
<input type='checkbox' name='cb'/>
<input type='submit'/>
</form>
<script type='text/javascript'>
function check(o)
{
    var msg = "";
	var checkboxes = document.getElementsByName('cb');
	for(var i = 0 ; i < checkboxes.length ; i ++)
	{
	    if(checkboxes[i].checked) msg +='第'+(i + 1) + "个被选中\n";
	}
	alert(msg)
}
</script>