js验证身份证号有效性并提示对应信息

直接上代码，逐行对代码进行研究，一定会有所收获。

function nunber(allowancePersonValue){
 if(allowancePersonValue=="身份证号"){
 $("#span_username").show();
 $("#span_username").html("身份证号不能为空");
 return false;
 }
 //校验长度，类型
 else if(isCardNo(allowancePersonValue) === false)
 {
$("#span_username").show();
 $("#span_username").html("您输入的身份证号码不正确，请重新输入");
 return false;
 }
 //检查省份
 else if(checkProvince(allowancePersonValue) === false)
 {
 $("#span_username").show();
 $("#span_username").html("您输入的身份证号码不正确,请重新输入");
 return false;
 }
 //校验生日
 else if(checkBirthday(allowancePersonValue) === false)
 {
 $("#span_username").show();
 $("#span_username").html("您输入的身份证号码生日不正确,请重新输入");
 return false;
 }
 //检验位的检测
 else if(checkParity(allowancePersonValue) === false)
 {
 $("#span_username").show();
 $("#span_username").html("您的身份证校验位不正确,请重新输入");
 return false;
 }else{
 $("#span_username").hide();
 return true;
 } 

} 

//身份证省的编码
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"
    }; 

//检查号码是否符合规范，包括长度，类型
function isCardNo(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){
 //alert("demo");
 return false;
 }
 return true;
} 

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

//检查生日是否正确
function checkBirthday(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
function verifyBirthday(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
function checkParity(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
function changeFivteenToEighteen(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;
} 

使用方法：

<input type="text" class="reg_txt" value="身份证号" titles="请输入您的身份证号！" name="userid" id="username" maxlength="40" onfocus="if(this.value=='身份证号'){this.value='';}" onblur="if(this.value==''){this.value='身份证号';}nunber(this.value);" style="border: 1px solid red;"><br>
<span class="c_red" id="span_username"></span> 

希望本文对大家学习javascript程序设计有所帮助。