ID card verification method provided by jquery form verification framework (sample code)_jquery

var aCity ={11:"Beijing",12:"Tianjin",13:"Hebei",14:"Shanxi",15:"Inner Mongolia",
21:"Liaoning",22:"Jilin",23:" Heilongjiang",31:"Shanghai",32:"Jiangsu",33:"Zhejiang",
34:"Anhui",35:"Fujian",36:"Jiangxi",37:"Shandong",41: "Henan",42:"Hubei",
43:"Hunan",44:"Guangdong",45:"Guangxi",46:"Hainan",50:"Chongqing",51:"Sichuan"
,52:"Guizhou",53:"Yunnan",54:"Tibet",61:"Shaanxi",62:"Gansu",63:"Qinghai",
64:"Ningxia",65:" Xinjiang",71:"Taiwan",81:"Hong Kong",82:"Macau",91:"Overseas"}


function isCardID(sId){
var iSum=0;
var info="" ;
if(!/^d{17}(d|x)$/i.test(sId)) return "The length or format of the ID card you entered is wrong";
sId=sId.replace(/x$/i,"a");
if(aCity[parseInt(sId.substr(0,2))]==null) return "Your ID card region is illegal" ;
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 "The date of birth on the ID card is illegal";
for(var i = 17;i>=0;i --) iSum = (Math.pow(2,i) % 11) * parseInt(sId .charAt(17 - i),11) ;
if(iSum !=1) return "The ID number you entered is illegal";
return true;//aCity[parseInt(sId.substr(0 ,2))] "," sBirthday "," (sId.substr(16,1)%2?"Male":"Female")
}