isCardID身份證驗證

function isCardID(sId){     var iSum=0 ;     var info="" ;     if(!/^\d{17}(\d|x)$/i.test(sId)) return "你輸入的身份證長度或格式錯誤";     sId=sId.replace(/x$/i,"a");     if(aCity[parseInt(sId.substr(0,2))]==null) return "你的身份證地區非法";     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 "身份證上的出生日期非法";     for(var i = 17;i>=0;i --) iSum += (Math.pow(2,i) % 11) * parseInt(sId.charAt(17 - i),11) ;     if(iSum%11!=1) return "你輸入的身份證號非法";     return true;//aCity[parseInt(sId.substr(0,2))]+","+sBirthday+","+(sId.substr(16,1)%2?"男":"女") }