<script>
    //身份证号合法性验证
    //支持18位身份证号
    //支持地址编码、出生日期、校验位验证
    function IdentityCodeValid(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 = "";
 
        if (!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[12])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$/i.test(code)) {
            tip = "身份证号格式错误";
            alert(tip);
            return;
        }
 
        if (!city[code.substr(0, 2)]) {
            tip = "地址编码错误";
            alert(tip);
            return;
        }
        if (code.length == 18) {
            sBirthday = code.substr(6, 4) + "-" + Number(code.substr(10, 2)) + "-" + Number(code.substr(12, 2));
            var d = new Date(sBirthday.replace(/-/g, "/"))
            if (sBirthday != (d.getFullYear() + "-" + (d.getMonth() + 1) + "-" + d.getDate())) {
                tip="非法生日";
                alert(tip);
            	return;
            }
        }
        //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";
                alert(tip);
            	return;
            }
 
        }
     
    }
</script>

JS身份证合法性校验完全版