判斷radio選中

    以下是代碼,保存為.html運行看看
    <form name="childform">
    <input type="radio" name="bbb" value="默認">默認<input type="radio" name="bbb" value="高興" />高興
    <input type="radio" name="bbb" value="黯然銷魂" />黯然銷魂
    <input type="button" onClick="check();" value="確定">
    </form>
    <script language="javascript">
    function check()
    {
    var num;
    num=document.childform.bbb.length;
    for (j=0;j<num;j++)
    {
    if(document.childform.bbb[j].checked)
    {
    alert(document.childform.bbb[j].value);
    }
    else
    {
    alert("沒有選擇!");break;
    }
    }
    }
    </script>