通过js来实现用身份证号来判断性别和出生年月

<input type="text" id="shenfenzhenghao" oninput="hao()" placeholder="证件号">
    <input type="text" id="xingbie" disabled="disabled" placeholder="性别">
    <input type="date" id="shengri" disabled="disabled" placeholder="出生年月">

// 通过身份证号来获取性别和生日
      //出生年月
      function hao() {
        // 获取身份证号的input标签
        let IDNu = document.getElementById('shenfenzhenghao');
        console.log(IDNu);
        var re =
          /^\d{6}(((19|20)\d{2}(0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])\d{3}([0-9]|x|X))|(\d{2}(0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])\d{3}))$/;
        if (!re.test(IDNu.value)) {
          // alert("身份证号码有误,请重新填写!");
          IDNu.focus();
          //location.replace("");
          return false;
        }
        var str = IDNu.value;
        console.log(str);
        var born_border = document.getElementById('shengri');
        try {
          if (typeof(eval(born_border)) == "undefined") {
            //alert('参数born_border为空');
          } else {
            born_border.value = str.substring(6, 10) + "-" + str.substring(10, 12) + "-" + str.substring(12, 14);
          }
        } catch (e) {
          //alert('参数born_border错误');
        }
        //性别 
        let sew = ''
        var sec = str.substring(16, 17);
        var sex = document.getElementById('xingbie');
        if (sec % 2 == 0) {
          sew = "女";
        } else {
          sew = "男";
        }
        console.log(sew);
        sex.value = sew;
        for (i = 0; i < sex.options.length; i++)
          if (sex.options[i].value == sew) {
            sex.options[i].selected = true;
          }
      }