js-身份证验证方法

function isCardID_zr(sId) {
            var iSum = 0;
            var info = "";
            var zz = /^\d{17}(\d|x)$/i;
            if(!zz.test(sId)) return false;
            sId = sId.replace(/x$/i, "a");
            var aCity={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"}
            if(aCity[parseInt(sId.substr(0, 2))] == null) return false;
            var sBirthday = sId.substr(6, 4) + "-" + Number(sId.substr(10, 2)) + "-" + Number(sId.substr(12, 2));
            var d = new Date(sBirthday.replace(/-/g, "/"));
            if(sBirthday != (d.getFullYear() + "-" + (d.getMonth() + 1) + "-" + d.getDate())) return false;
            for(var i = 17; i >= 0; i--) iSum += (Math.pow(2, i) % 11) * parseInt(sId.charAt(17 - i), 11);
            if(iSum % 11 != 1) return false;
            return true;
        }