有两种方法，亲测好用~
法一：点击查看原文
/*根据出生日期算出年龄*/
function jsGetAge(strBirthday){
var returnAge;
var strBirthdayArr=strBirthday.split("-");
var birthYear = strBirthdayArr[0];
var birthMonth = strBirthdayArr[1];
var birthDay = strBirthdayArr[2];
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
}
法二：点击查看原文
var birthday=new Date("1989-06-25".replace(/-/g, "\/"));
var d=new Date();
var age = d.getFullYear()-birthday.getFullYear()-((d.getMonth()<birthday.getMonth()|| d.getMonth()==birthday.getMonth() && d.getDate()<birthday.getDate())?1:0);
