vue 计算出生日期当前的年龄

 analyzeIDCard(IDCard){

  var age = 0,yearBirth,monthBirth,dayBirth;

  //获取用户身份证号码

  var userCard = IDCard;

  //如果身份证号码为undefind则返回空

  if(!userCard){

    return age;

  }

  var reg = /(^\d{15}$)|(^\d{17}([0-9]|X)$)/; //验证身份证号码的正则

  if (reg.test(userCard)) {

    if (userCard.length == 15) {

        var org_birthday = userCard.substring(6, 12);

        //获取出生年月日

        yearBirth = "19" + org_birthday.substring(0, 2);

        monthBirth = org_birthday.substring(2, 4);

        dayBirth = org_birthday.substring(4, 6);

        } else if (userCard.length == 18) {

        //获取出生年月日

        yearBirth = userCard.substring(6,10);

        monthBirth = userCard.substring(10,12);

        dayBirth = userCard.substring(12,14);

      }

      //获取当前年月日并计算年龄

      var myDate = new Date();

      var monthNow = myDate.getMonth() + 1;

      var dayNow = myDate.getDate();

      var age = myDate.getFullYear() - yearBirth;

      if(monthNow < monthBirth || (monthNow == monthBirth && dayNow < dayBirth)){

        age--;

      }

      //返回年龄

      return age;

  } else {

    return ''

  }

},