身份证验证JS程序
function checkidcardfun(code) {

    var city = {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: "* ", 61: "陕西", 62: "甘肃", 63: "青海", 64: "宁夏", 65: "*", 71: "*", 81: "香港", 82: "澳门", 91: "国外 "};

    var tip = "";

    var pass = true;

    if (!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3,5}(\d|X)$/i.test(code)) {

        tip = "身份证号格式错误";

        pass = false;

    }

    else if (!city[code.substr(0, 2)]) {

        tip = "地址编码错误";

        pass = false;

    }

    else {

        //18位身份证需要验证最后一位校验位

        if (code.length == 18) {

            code = code.split('');

            //∑(ai×Wi)(mod 11)

            //加权因子

            var factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];

            //校验位

            var parity = [1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2];

            var sum = 0;

            var ai = 0;

            var wi = 0;

            for (var i = 0; i < 17; i++)

            {

                ai = code[i];

                wi = factor[i];

                sum += ai * wi;

            }

            var last = parity[sum % 11];

            if (parity[sum % 11] != code[17]) {

                tip = "校验位错误";

                pass = false;

            }

        }

    }

    return pass;

}