摘要：
//根据出生日期函数getAge｛varreturnAge=“”；varmouthAge=''；varstrBirthdayArr=strBirthday.split（“-”）；varbirthYear=strBirthdyArr[0]；varbirth Month=strBirth dayArr[1]；varbirghtDay=strBirghtdayArr[2]；vard=newDate（）；varnowYear=d.getFullYear（）；varnowMonth=d.getMonth（）+1；varnowDay=d.getDate（）｛//returnAge=0；//在同一年，它是0岁varmonthDiff=nowMonth birthMonth；//如果｛｝else｛MouthAge=monthDiff+'months‘；｝否则｛varageDiff=nowYear-firstYear；//如果｛if｛vardayDiff=nowDay birthDay；//如果{returnAge=ageDiff-1+'Year'；｝否则｛returnAge=ageDiff+'年'；｝｝否则｛varmonthDiff=nowMonth firstMonth；//如果｛returnAge=ageDiff-1+‘year’；｝否则｛MouthAge=monthDiff+'月'；returnAge=ageDiff+'年'；｝｝否则｛returnAge=-1；//返回-1表示输入的出生日期晚于今天｝｝returnAge+moreAge//返回第一年年龄+Month｝
// 根据出生日期计算年龄周岁 function getAge(strBirthday) { var returnAge = ''; var mouthAge = ''; var strBirthdayArr = strBirthday.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 var monthDiff = nowMonth - birthMonth; //月之差 if (monthDiff < 0) { } else { mouthAge = monthDiff + '个月'; } } 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 + '岁'; } else { returnAge = ageDiff + '岁'; } } else { var monthDiff = nowMonth - birthMonth; //月之差 if (monthDiff < 0) { returnAge = ageDiff - 1 + '岁'; } else { mouthAge = monthDiff + '个月'; returnAge = ageDiff + '岁'; } } } else { returnAge = -1; //返回-1 表示出生日期输入错误 晚于今天 } } return returnAge + mouthAge; //返回周岁年龄+月份 }