JS验证radio和checkbox是否被选

function CheckForm() {    var flag = false;    var allRadio = document.form.elements["miaoshu"];    var txtBox = document.getElementById("txtBox").value;    for (var i = 0; i < allRadio.length; i++) {        if (allRadio[i].checked) {            if (allRadio[allRadio.length - 1].checked) {                if (txtBox == "") {                    flag = false;                }                else {                    flag = true;                }            }        }    }    if (!flag) {        alert("请确定输入完整");    }    var cbxs = document.getElementsByName('love');    var s = 0;    for (var i = 0; i < cbxs.length; i++) {        if (cbxs[i].checked)        { s += 1; }    }    if (s < 1) {        alert("请确定输入完整");        flag = false;    }    return flag;}