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JavaScript验证身份证号码

//校验地区
function checkProv(val) {
    let pattern = /^[1-9][0-9]/;
    let provs = {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"};
    if(pattern.test(val)) {
        if(provs[val]) {
            return true;
        }
    }
    return false;
}
//校验出生日期
function checkDate(val) {
    let pattern = /^(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)$/;
    if(pattern.test(val)) {
        let year = val.substring(0, 4);
        let month = val.substring(4, 6);
        let date = val.substring(6, 8);
        let date2 = new Date(year+"-"+month+"-"+date);
        if(date2 && date2.getMonth() == (parseInt(month) - 1)) {
            return true;
        }
    }
    return false;
}
//校验位
function checkCode(val) {
    let p = /^[1-9]\d{5}(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;
    let factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
    let parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
    let code = val.substring(17);
    if(p.test(val)) {
        let sum = 0;
        for(let i=0;i<17;i++) {
            sum += val[i]*factor[i];
        }
        if(parity[sum % 11] == code.toUpperCase()) {
            return true;
        }
    }
    return false;
}
function checkID(val) {
    if(checkCode(val)) {
        let date = val.substring(6,14);
        if(checkDate(date)) {
            if(checkProv(val.substring(0,2))) {
                return true;
            }
        }
    }
    return false;
}
//使用时调用checkID()即可;
checkID("3714811991******541X")
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