Angular 6 自定义校验器校验身份证

/**
 * 自定义身份校验器
 * */
import { FormControl} from ‘@angular/forms‘;
export function identityNoValidator(input: FormControl) {
    const value = input.value;
    if (checkCode(value)) {
        console.log(‘checkCode‘);
        let date = value.substring(6,14);
        if (checkDate(date)) {
            console.log(‘checkDate‘);
            if (checkPro(value.substring(0,2))) {
                console.log(‘checkPro‘);
                    return null;
            } else {
                return {‘errors‘: true};
            }
        } else {
            return {‘errors‘: true};
        }
    } else {
        return {‘errors‘: true};
    }
}
function checkCode(val: string) {
    let reg = /^[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]$/;
    // 17 位加权因子
    let divisor = [7,9,10,5,8,4,2,1,6,3,7,2];
    // 校验码列表mod11,对应校验码字符值
    let validCode = [‘1‘,‘0‘,‘X‘,‘9‘,‘8‘,‘7‘,‘6‘,‘5‘,‘4‘,‘3‘,‘2‘];
    if (!reg.test(val)) {
        console.log(‘正则表达式未通过‘);
        return false;
    } else {
        let sum = 0;
        for (let i = 0; i < 17; i++) {
            // 17位每一位数 乘以加权因子 的 和
            sum += Number.parseInt(val[i]) * divisor[i];
        }
        let index = sum % 11;
        return validCode[index].toUpperCase() === val[17];
    }

}
// 检查日期
function checkDate(val: string) {
    const pattern = /^(18|19|20)d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)$/;
    if (pattern.test(val)) {
        const year = val.substring(0,4);
        const month = val.substring(4,6);
        const date = val.substring(6,8);
        const date2 = new Date(year + ‘-‘ + month + ‘-‘ + date);
        return date2 && date2.getMonth() === (parseInt(month) - 1);
    }
    return false;
}
// 检查省市编号
function  checkPro(val: string) {
    const pattern = /^[1-9][0-9]/;
    const 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)) {
        return !!provs[val];
    }
    return false;
}

this.validateForm.get(‘corporation_credentials_number‘).setValidators(identityNoValidator);