JS implements method to get age based on date of birth

In this article, we mainly share with you the JS method to obtain age based on date of birth, hoping to help everyone.

JavaScript//JS根据出生日期 得到年龄                 //参数strBirthday已经是正确格式的2017-12-12这样的日期字符串  function jsGetAge(strBirthday)  {         
    var returnAge;  
    var strBirthdayArr=strBirthday.split("-");  
    var birthYear = strBirthdayArr[0];  
    var birthMonth = strBirthdayArr[1];  
    var birthDay = strBirthdayArr[2];  
    var d = new Date();  
    var nowYear = d.getYear();  
    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  }

                                                                                                             

JavaScript//JS根据出生日期 得到年龄                 //参数strBirthday已经是正确格式的2017-12-12这样的日期字符串  function jsGetAge(strBirthday)  {         
    var returnAge;  
    var strBirthdayArr=strBirthday.split("-");  
    var birthYear = strBirthdayArr[0];  
    var birthMonth = strBirthdayArr[1];  
    var birthDay = strBirthdayArr[2];  

    var d = new Date();  
    var nowYear = d.getYear();  
    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  }

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