js 检测身份证

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>校验身份证</title>
    <script>
     //校验身份证
  function checkIdcard(idcard) {
      var Errors = new Array(
              "true",
              "身份证号码位数不对!",
              "身份证号码出生日期超出范围或含有非法字符!",
              "身份证号码校验错误!",
              "身份证地区非法!"
              );
      var area = {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"}
      var idcard,Y,JYM;
      var S,M;
      var idcard_array = new Array();
      idcard_array = idcard.split("");
      //地区检验
      if (area[parseInt(idcard.substr(0, 2))] == null) return Errors[4];
      //身份号码位数及格式检验
      switch (idcard.length) {
          case 15:
              if ((parseInt(idcard.substr(6, 2)) + 1900) % 4 == 0 || ((parseInt(idcard.substr(6, 2)) + 1900) % 100 == 0 && (parseInt(idcard.substr(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}$/;
                  //测试出生日期的合法性
              } else {
                  ereg = /^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}$/;
                  //测试出生日期的合法性
              }
              if (ereg.test(idcard)) return Errors[0];
              else return Errors[2];
              break;
          case 18:
          //18位身份号码检测
          //出生日期的合法性检查
          //闰年月日:((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]))
          //平年月日:((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(idcard.substr(6, 4)) % 4 == 0 || (parseInt(idcard.substr(6, 4)) % 100 == 0 && parseInt(idcard.substr(6, 4)) % 4 == 0 )) {
                  ereg = /^[1-9][0-9]{5}(19|20)[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]$/;
                  //闰年出生日期的合法性正则表达式
              } else {
                  ereg = /^[1-9][0-9]{5}(19|20)[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}[0-9Xx]$/;
                  //平年出生日期的合法性正则表达式
              }
              if (ereg.test(idcard)) {//测试出生日期的合法性
                  //计算校验位
                  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 = JYM.substr(Y, 1);
                  //判断校验位
                  if (M == idcard_array[17].toUpperCase()) return Errors[0]; //检测ID的校验位
                  else return Errors[3];
              }
              else return Errors[2];
              break;
          default:
              return Errors[1];
              break;
      }
  }
  function check()
  {
   var card=document.getElementById("card");
   var result=checkIdcard(card.value);
   if(result=='true')
    document.getElementById("info").innerHTML="<font color='blue'>身份证校验正确</font>";
   else
    document.getElementById("info").innerHTML="<font color='red'>"+result+"</font>";
  }
    </script>
  </head>
  <body>
    身份证:<input type="text" id="card" size="20">&nbsp;&nbsp;&nbsp;<input type="button" value="校验身份证" onclick="check();"><br><br>
    <div id="info"></div>
  </body>
</html>

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