js 获取年龄

}

const jsGetAge = (strBirthday) => {

var date = new Date(strBirthday);

date = date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate()

var returnAge;

var strBirthdayArr = date.split("-");

var birthYear = strBirthdayArr[0];

var birthMonth = strBirthdayArr[1];

var birthDay = strBirthdayArr[2];

var d = new Date();

var nowYear = d.getFullYear();

var nowMonth = d.getMonth() + 1;

var nowDay = d.getDate();

if (nowYear == birthYear) {

returnAge = 0; //同年 则为0岁

} else {

var ageDiff = nowYear - birthYear; //年之差

if (ageDiff > 0) {

if (nowMonth == birthMonth) {

var dayDiff = nowDay - birthDay; //日之差

if (dayDiff < 0) {

returnAge = ageDiff - 1;

} else {

returnAge = ageDiff;

}

} else {

var monthDiff = nowMonth - birthMonth; //月之差

if (monthDiff < 0) {

returnAge = ageDiff - 1;

} else {

returnAge = ageDiff;

}

}

} else {

returnAge = -1; //返回-1 表示出生日期输入错误 晚于今天

}

}

 

return returnAge; //返回周岁年龄

}