Simple implementation of ID card verification based on javascript_javascript skills

The example in this article introduces the key code of javascript to simply implement the verification of ID cards, and shares it with everyone for your reference. The specific content is as follows

var vcity={ 11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古", 
21:"辽宁",22:"吉林",23:"黑龙江",31:"上海",32:"江苏", 
33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南", 
42:"湖北",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆", 
51:"四川",52:"贵州",53:"云南",54:"西藏",61:"陕西",62:"甘肃", 
63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外" 
}; 

checkCard = function(card) 
{ 

//是否为空 
if(card === '') 
{ 

return "请输入身份证号，身份证号不能为空"; 
} 
//校验长度，类型 
if(isCardNo(card) === false) 
{ 

return "您输入的身份证号码不正确，请重新输入"; 
} 
//检查省份 
if(checkProvince(card) === false) 
{ 
return "您输入的身份证号码不正确,请重新输入"; 
} 
//校验生日 
if(checkBirthday(card) === false) 
{ 
return "您输入的身份证号码生日不正确,请重新输入"; 
} 
//检验位的检测 
if(checkParity(card) === false) 
{ 
return "您的身份证校验位不正确,请重新输入"; 
} 

return "ok"; 
}; 


//检查号码是否符合规范，包括长度，类型 
isCardNo = function(card) 
{ 
//身份证号码为15位或者18位，15位时全为数字，18位前17位为数字，最后一位是校验位，可能为数字或字符X 
var reg = /(^\d{15}$)|(^\d{17}(\d|X)$)/; 
if(reg.test(card) === false) 
{ 
return false; 
} 

return true; 
}; 

//取身份证前两位,校验省份 
checkProvince = function(card) 
{ 
var province = card.substr(0,2); 
if(vcity[province] == undefined) 
{ 
return false; 
} 
return true; 
}; 

//检查生日是否正确 
checkBirthday = function(card) 
{ 
var len = card.length; 
//身份证15位时，次序为省（3位）市（3位）年（2位）月（2位）日（2位）校验位（3位），皆为数字 
if(len == '15') 
{ 
var re_fifteen = /^(\d{6})(\d{2})(\d{2})(\d{2})(\d{3})$/; 
var arr_data = card.match(re_fifteen); 
var year = arr_data[2]; 
var month = arr_data[3]; 
var day = arr_data[4]; 
var birthday = new Date('19'+year+'/'+month+'/'+day); 
return verifyBirthday('19'+year,month,day,birthday); 
} 
//身份证18位时，次序为省（3位）市（3位）年（4位）月（2位）日（2位）校验位（4位），校验位末尾可能为X 
if(len == '18') 
{ 
var re_eighteen = /^(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)$/; 
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; 
}; 

//校验日期 
verifyBirthday = function(year,month,day,birthday) 
{ 
var now = new Date(); 
var now_year = now.getFullYear(); 
//年月日是否合理 
if(birthday.getFullYear() == year && (birthday.getMonth() + 1) == month && birthday.getDate() == day) 
{ 
//判断年份的范围（3岁到100岁之间) 
var time = now_year - year; 
if(time >= 3 && time <= 100) 
{ 
return true; 
} 
return false; 
} 
return false; 
}; 

//校验位的检测 
checkParity = function(card) 
{ 
//15位转18位 
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位转18位身份证号 
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; 
};

The above is the entire content of this article. I hope it will be helpful to everyone in implementing javascript ID card verification.