验证身份证号码

 //验证身份证号方法
 var test = function(idcard) {
     var Errors = new Array("验证通过!", "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("");
     if (area[parseInt(idcard.substr(0, 2))] == null) return Errors[4];
     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:
             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[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]$/; //闰年出生日期的合法性正则表达式
             } else {
                 ereg = /^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}[0-9Xx]$/; //平年出生日期的合法性正则表达式
             }
             if (ereg.test(idcard)) {
                 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);
                 if (M == idcard_array[17]) return Errors[0];
                 else return Errors[3];
             } else return Errors[2];
             break;
         default:
             return Errors[1];
             break;
     }
 }
 //测试代码
 var theid = prompt("请输入身份证号码", "15位或18位");
 if (theid != "") {
     document.write(test(theid));
 } else {
     //theid=prompt("请输入身份证号码","15位或18位");
 }