javascript判断身份证号信息是否正确的方法

checkRealCard:function(strRealCard){
var getAppendZore = function(strNum){
if(strNum < 10){ strNum = '0'+strNum; }
return strNum;
};
var tmpRealCard = strRealCard;
var tmpCityCode = { 11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "内蒙古", 21: "辽宁", 22: "吉林", 23: "黑龙江", 31: "上海", 32: "江苏", 33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山东", 41: "河南", 42: "湖北", 43: "湖南", 44: "广东", 45: "广西", 46: "海南", 50: "重庆", 51: "四川", 52: "贵州", 53: "云南", 54: "西藏", 61: "陕西", 62: "甘肃", 63: "青海", 64: "宁夏", 65: "新疆", 71: "台湾", 81: "香港", 82: "澳门", 91: "国外" };

if (tmpRealCard == ''){ return '身份证号码不能为空'; }

// Check real card.
var tmpRegx=new RegExp(/(^\d{15}$)|(^\d{17}(\d|x|X)$)/i);
if (!tmpRegx.exec(tmpRealCard)){
return '身份证号码长度必须正确，请核对！';
}

// Check 15 length.
var tmpRegx=new RegExp(/^[1-9]\d{7}((0\d)|(1[0-2]))(([0|1|2]\d)|3[0-1])\d{3}$/);
if (tmpRegx.exec(tmpRealCard)){
tmpBirthday = '19'+tmpRealCard.substring(6,8)+'-'+tmpRealCard.substring(8,10)+'-'+tmpRealCard.substring(10,12);
}else{
tmpSum = 0;

tmpRealCard = tmpRealCard.replace(/x|X$/i,"a");

for (var i = 17; i >= 0; i--){
tmpSum += (Math.pow(2, i) % 11) * parseInt(tmpRealCard.charAt(17 - i), 11);
}

if (tmpSum % 11 != 1) {
return '身份证号码不符相关标准，请核对！';
}

tmpBirthday = tmpRealCard.substring(6,10)+'-'+tmpRealCard.substring(10,12)+'-'+tmpRealCard.substring(12,14);
}

// Check City.
if (tmpCityCode[parseInt(tmpRealCard.substring(0, 2))] == null){
return '身份证号码证件地区未知，请核对！';
}

// Check Birthday.
var tmpDate = new Date(tmpBirthday.replace(/-/g, "/"));
if (tmpBirthday != (tmpDate.getFullYear()+'-'+ getAppendZore(tmpDate.getMonth()+1)+'-'+ getAppendZore(tmpDate.getDate()))){
return '身份证号码出生日期非法，请核对！';
}

//alert(tmpBirthday);
return true;
},