javascript based on the simple realization of identity card verification

This article introduces the key code of javascript simple verification of id card, and shares it with you for your reference. The specific content is as follows

var vcity={ 11:" Beijing ",12:" tianjin ",13:" hebei ",14:" shanxi ",15:" Inner Mongolia ", 
21:" liaoning ",22:" Ji Lin ",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:"4 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:" foreign " 
}; 

checkCard = function(card) 
{ 

// Whether is empty  
if(card === '') 
{ 

return " Please input id number, id number cannot be empty "; 
} 
// Check length, type  
if(isCardNo(card) === false) 
{ 

return " The ID number you entered is not correct, please re-enter it "; 
} 
// Check the province  
if(checkProvince(card) === false) 
{ 
return " The ID number you entered is not correct , Please re-enter "; 
} 
// Check the birthday  
if(checkBirthday(card) === false) 
{ 
return " The id number you entered is incorrect , Please re-enter "; 
} 
// The detection of check bits  
if(checkParity(card) === false) 
{ 
return " Your id check digit is incorrect , Please re-enter "; 
} 

return "ok"; 
}; 


// Check if the number conforms to the specification, including length, type  
isCardNo = function(card) 
{ 
// Id Card No. 15 Bits or 18 position 15 The bits are all numbers, 18 former 17 The digits are numbers, and finally 1 A bit is a check bit and may be a number or character X 
var reg = /(^\d{15}$)|(^\d{17}(\d|X)$)/; 
if(reg.test(card) === false) 
{ 
return false; 
} 

return true; 
}; 

// Take the first two id cards , Check provinces  
checkProvince = function(card) 
{ 
var province = card.substr(0,2); 
if(vcity[province] == undefined) 
{ 
return false; 
} 
return true; 
}; 

// Check if the birthday is correct  
checkBirthday = function(card) 
{ 
var len = card.length; 
// Id card 15 Bit, the order is province ( 3 (a) 3 A) in ( 2 (a) month 2 (a), 2 Bit) Check bit ( 3 Digits), are numbers  
if(len == '15') 
{ 
var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/; 
var arr_data = card.match(re_fifteen); 
var year = arr_data[2]; 
var month = arr_data[3]; 
var day = arr_data[4]; 
var birthday = new Date('19'+year+'/'+month+'/'+day); 
return verifyBirthday('19'+year,month,day,birthday); 
} 
// Id card 18 Bit, the order is province ( 3 (a) 3 A) in ( 4 (a) month 2 (a), 2 Bit) Check bit ( 4 ), the end of the check bit may be X 
if(len == '18') 
{ 
var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/; 
var arr_data = card.match(re_eighteen); 
var year = arr_data[2]; 
var month = arr_data[3]; 
var day = arr_data[4]; 
var birthday = new Date(year+'/'+month+'/'+day); 
return verifyBirthday(year,month,day,birthday); 
} 
return false; 
}; 

// Check the date  
verifyBirthday = function(year,month,day,birthday) 
{ 
var now = new Date(); 
var now_year = now.getFullYear(); 
// Is the year month day reasonable  
if(birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day) 
{ 
// Range of Year ( 3 To the age of 100 Between the ages of ) 
var time = now_year - year; 
if(time >= 3 && time <= 100) 
{ 
return true; 
} 
return false; 
} 
return false; 
}; 

// Check bit detection  
checkParity = function(card) 
{ 
//15 A turn 18 position  
card = changeFivteenToEighteen(card); 
var len = card.length; 
if(len == '18') 
{ 
var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); 
var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); 
var cardTemp = 0, i, valnum; 
for(i = 0; i < 17; i ++) 
{ 
cardTemp += card.substr(i, 1) * arrInt[i]; 
} 
valnum = arrCh[cardTemp % 11]; 
if (valnum == card.substr(17, 1)) 
{ 
return true; 
} 
return false; 
} 
return false; 
}; 

//15 A turn 18 Id number  
changeFivteenToEighteen = function(card) 
{ 
if(card.length == '15') 
{ 
var arrInt = new Array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); 
var arrCh = new Array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); 
var cardTemp = 0, i; 
card = card.substr(0, 6) + '19' + card.substr(6, card.length - 6); 
for(i = 0; i < 17; i ++) 
{ 
cardTemp += card.substr(i, 1) * arrInt[i]; 
} 
card += arrCh[cardTemp % 11]; 
return card; 
} 
return card; 
};

Above is the entire content of this article, I hope to help you to implement javascript id check.