isCardID身份证验证

function isCardID(sId){
    var iSum=0 ;
    var info="" ;
    if(!/^\d{17}(\d|x)$/i.test(sId)) return "你输入的身份证长度或格式错误";
    sId=sId.replace(/x$/i,"a");
    if(aCity[parseInt(sId.substr(0,2))]==null) return "你的身份证地区非法";
    sBirthday=sId.substr(6,4)+"-"+Number(sId.substr(10,2))+"-"+Number(sId.substr(12,2));
    var d=new Date(sBirthday.replace(/-/g,"/")) ;
    if(sBirthday!=(d.getFullYear()+"-"+ (d.getMonth()+1) + "-" + d.getDate()))return "身份证上的出生日期非法";
    for(var i = 17;i>=0;i --) iSum += (Math.pow(2,i) % 11) * parseInt(sId.charAt(17 - i),11) ;
    if(iSum%11!=1) return "你输入的身份证号非法";
    return true;//aCity[parseInt(sId.substr(0,2))]+","+sBirthday+","+(sId.substr(16,1)%2?"男":"女")
}