function checkIdcard(idcard) {        var Errors = new Array(        "驗證通過!",        "身份證號碼位數不對!",        "身份證號碼出生日期超出范圍或含有非法字符!",        "身份證號碼校驗錯誤!",        "身份證地區非法!"        );        var area = { 11: "北京", 12: "天津", 13: "河北", 14: "山西", 15: "內蒙古", 21: "遼寧", 22: "吉林", 23: "黑龍江", 31: "上海", 32: "江蘇", 33: "浙江", 34: "安徽", 35: "福建", 36: "江西", 37: "山東", 41: "河南", 42: "湖北", 43: "湖南", 44: "廣東", 45: "廣西", 46: "海南", 50: "重慶", 51: "四川", 52: "貴州", 53: "云南", 54: "西藏", 61: "陜西", 62: "甘肅", 63: "青海", 64: "寧夏", 65: "新疆", 71: "臺灣", 81: "香港", 82: "澳門", 91: "國外" }        var idcard, Y, JYM;        var S, M;        var idcard_array = new Array();        idcard_array = idcard.split("");        //地區檢驗           if (area[parseInt(idcard.substr(0, 2))] == null) return Errors[4];        //身份號碼位數及格式檢驗           switch (idcard.length) {            //15位身份號碼檢測              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}$/;//測試出生日期的合法性                   } else {                    ereg = /^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}$/;//測試出生日期的合法性                   }                if (ereg.test(idcard)) return Errors[0];                else return Errors[2];                break;            //18位身份號碼檢測              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]$/;//閏年出生日期的合法性正則表達式                   } else {                    ereg = /^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}[0-9Xx]$/;//平年出生日期的合法性正則表達式                   }                if (ereg.test(idcard)) {//測試出生日期的合法性                       //計算校驗位                       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);//判斷校驗位                       if (M == idcard_array[17]) return Errors[0];//檢測ID的校驗位                       else return Errors[3];                }                else return Errors[2];                break;            default:                return Errors[1];                break;        }    }