function checkIdcard(idcard){
var Errors=new Array(
"Verification passed",
"The number of numbers is wrong!",
"The number is born out of range or contains illegal characters!",
"Number verification error!",
"The area is illegal!"
);
var idcard,Y,JYM;
var S,M;
var idcard_array = new Array();
idcard_array = ("");
//Regional Inspection
if(area[parseInt((0,2))]==null) return Errors[4];
//Check the number of digits and formats of the identity number
switch(){
case 15:
if ( (parseInt((6,2))+1900) % 4 == 0 || ((parseInt((6,2))+1900) % 100 == 0 && (parseInt((6,2))+1900) % 4 == 0 )){
ereg=/^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))[0-9]{3}$/;//Test the legality of the date of birth
} else {
ereg=/^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}$/;//Test the legality of the date of birth
}
if((idcard)) return Errors[0];
else return Errors[2];
break;
case 18:
//18-digit identity number detection
//The legality check of the date of birth
//Leap year Month and Date: ((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))
//Previous year, month and day: ((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))
if ( parseInt((6,4)) % 4 == 0 || (parseInt((6,4)) % 100 == 0 && parseInt((6,4))%4 == 0 )){
ereg=/^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))[0-9]{3}[0-9Xx]$/;//Legality regular expression for dates of birth in leap years
} else {
ereg=/^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}[0-9Xx]$/;//The legality regular expression of the date of birth in the ordinary year is the regular expression of the date of birth.
}
if((idcard)){//Test the legality of the date of birth
// Calculate the check bit
S = (parseInt(idcard_array[0]) + parseInt(idcard_array[10])) * 7
+ (parseInt(idcard_array[1]) + parseInt(idcard_array[11])) * 9
+ (parseInt(idcard_array[2]) + parseInt(idcard_array[12])) * 10
+ (parseInt(idcard_array[3]) + parseInt(idcard_array[13])) * 5
+ (parseInt(idcard_array[4]) + parseInt(idcard_array[14])) * 8
+ (parseInt(idcard_array[5]) + parseInt(idcard_array[15])) * 4
+ (parseInt(idcard_array[6]) + parseInt(idcard_array[16])) * 2
+ parseInt(idcard_array[7]) * 1
+ parseInt(idcard_array[8]) * 6
+ parseInt(idcard_array[9]) * 3 ;
Y = S % 11;
M = "F";
JYM = "10X98765432";
M = (Y,1);//Judge the check bit
if(M == idcard_array[17]) return Errors[0]; //Check bit of the detection ID
else return Errors[3];
}
else return Errors[2];
break;
default:
return Errors[1];
break;
}
}