关于身份证的一些处理方法总结

1.身份证前四后三脱敏

/**
   * 脱敏身份证号，前四后三，中间有多少位就有多少个*
   */
  function formatIdNumber(idNum) {
    if (typeof idNum !== 'string') {
      return '';
    }

    if (idNum.length < 7) {
      return idNum;
    }

    let star = '*'.repeat(idNum.length - 7);
    let value = idNum.slice(0, 4) + star + idNum.slice(idNum.length - 3);
    return value;
  }
  console.log(formatIdNumber('371234201001312016'), '身份证脱敏')

2. 判断身份证是否成年

  /* 判断身份是否成年 */
  function isAdult(certNo) {
    // 截取身份证年月日
    let certYear = certNo.substr(6, 4);
    let certMonth = certNo.substr(10, 2);
    let certDate = certNo.substr(12, 2);
    // 获取当前年月日
    let date = new Date();
    let nowYear = date.getFullYear() - 18 + '';
    let nowMonth = date.getMonth() + 1 + '';
    let nowDate = date.getDate() + '';
    if (nowMonth.length == 1) {
      nowMonth = '0' + nowMonth;
    }
    if (nowDate.length == 1) {
      nowDate = '0' + nowDate;
    }
    let cert = certYear + certMonth + certDate;
    let now = nowYear + nowMonth + nowDate + '';
    return now - cert > 0;
  }
  console.log(isAdult('371234201001312016'), '身份证')

3. 检验身份证是否合法

 /**
  * @desc  检查字符串是否为合法的身份证号码
  * @param {String} id 需要校验的身份证号码
  * @return {Boolean} 是否合法身份证号码
  * @example testIdNumber('430421197710177894') => false
  */
  function testIdNumber(id) {
    const AREA_CODE = {
      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"
    }

    switch (id.length) {
      case 15:
      case 18: {
        break
      }
      default: {
        return false
      }
    }

    const testInt = id.length == 15 ? id : id.substr(0, 17)

    /* if (!_.isInteger(Number(testInt))) {  //“_.isInteger引用了js库 loadsh 的方法，检验是否为整数”
      return false
    } */

    const areaCode = parseInt(id.substr(0, 2))

    if (!AREA_CODE[areaCode]) {
      return false
    }

    const birthDay = (id.length == 15) ? ("19" + id.substr(6, 6)) : id.substr(6, 8)
    /* if (!_.isInteger(Number(birthDay))) {
      return false
    } */

    if (id.length == 18) {
      const testNumber = (parseInt(id.charAt(0)) + parseInt(id.charAt(10))) * 7 + (parseInt(id.charAt(1)) + parseInt(id
        .charAt(11))) * 9 + (parseInt(id.charAt(2)) + parseInt(id.charAt(12))) * 10 + (parseInt(id.charAt(3)) +
        parseInt(id.charAt(13))) * 5 + (parseInt(id.charAt(4)) + parseInt(id.charAt(14))) * 8 + (parseInt(id.charAt(
        5)) + parseInt(id.charAt(15))) * 4 + (parseInt(id.charAt(6)) + parseInt(id.charAt(16))) * 2 + parseInt(id
        .charAt(7)) * 1 + parseInt(id.charAt(8)) * 6 + parseInt(id.charAt(9)) * 3;

      if (id.charAt(17) != "10X98765432".charAt(testNumber % 11)) {
        return false
      }
    }

    return true
  }

  console.log(testIdNumber('371234201001312016'), '检验身份证是否合法')

　　注释： lodash 网址：https://www.lodashjs.com/