从盛大通行证上摘下来的身份证验证js代码

<script language="javascript" type="text/javascript">
function CheckIdCardField(v_card) {
var reg = /^\d{15}(\d{2}[0-9X])?$/i;
if (!reg.test(v_card)) {
return false;
}
if (v_card.length == 15) {
var n = new Date();
var y = n.getFullYear();
if (parseInt("19" + v_card.substr(6, 2)) < 1900 || parseInt("19" + v_card.substr(6, 2)) > y) {
return false;
}
var birth = "19" + v_card.substr(6, 2) + "-" + v_card.substr(8, 2) + "-" + v_card.substr(10, 2);
if (!isDate(birth)) {
return false;
}
}
if (v_card.length == 18) {
var n = new Date();
var y = n.getFullYear();
if (parseInt(v_card.substr(6, 4)) < 1900 || parseInt(v_card.substr(6, 4)) > y) {
return false;
}
var birth = v_card.substr(6, 4) + "-" + v_card.substr(10, 2) + "-" + v_card.substr(12, 2);
if (!isDate(birth)) {
return false;
}
iW = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1);
iSum = 0;
for (i = 0; i < 17; i++) {
iC = v_card.charAt(i);
iVal = parseInt(iC);
iSum += iVal * iW[i];
}
iJYM = iSum % 11;
if (iJYM == 0) sJYM = "1";
else if (iJYM == 1) sJYM = "0";
else if (iJYM == 2) sJYM = "x";
else if (iJYM == 3) sJYM = "9";
else if (iJYM == 4) sJYM = "8";
else if (iJYM == 5) sJYM = "7";
else if (iJYM == 6) sJYM = "6";
else if (iJYM == 7) sJYM = "5";
else if (iJYM == 8) sJYM = "4";
else if (iJYM == 9) sJYM = "3";
else if (iJYM == 10) sJYM = "2";
var cCheck = v_card.charAt(17).toLowerCase();
if (cCheck != sJYM) {
return false;
}
}
return true;
}
</script>