javascript 取radionbutton值

function CheckraBtnList(flowTime)
{
    var rabtnList = document.getElementsByTagName("input");
    var radioLabels = document.getElementsByTagName("label");

    var selectedId;
    var selectedText;
    var mictBeginTime;
    for (var i = 0; i < rabtnList.length; i++) {

        if (rabtnList[i].type == "radio")
        {
            if (rabtnList[i].checked) {
                selectedId = rabtnList[i].id;
              
                for (var j = 0; j < radioLabels.length; j++) {
                    if (selectedId == radioLabels[j].getAttributeNode('for').value)
                     {
                         selectedText = radioLabels[j].innerText;                    }
                }
            }
        }
    }
}