1.距离生日还有多少天:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> //给出生日的月份和日期,计算还有多少天过生日 function getDaysToBirthday(month, day) { var nowTime = new Date(); var thisYear = nowTime.getFullYear(); //今年的生日 var birthday = new Date(thisYear, month - 1, day); //今年生日已过,则计算距离明年生日的天数 if (birthday < nowTime) { birthday.setFullYear(nowTime.getFullYear() + 1); } var timeDec = birthday - nowTime; var days = timeDec / (24 * 60 * 60 * 1000); return Math.ceil(days); } getDaysToBirthday(11, 2); </script> </body> </html>
2.根据出生年月日,计算年龄:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> //是否闰年 function isLeap(year){ return (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0); } //根据出生年月日,计算年龄 function getAge(year, month, day) { //得到当前日期 var nowTime = new Date(); var age = nowTime.getFullYear() - year;//粗略计算出年龄 //若生日是2月29日,且今年不是闰年,则今年生日日期按28日计算 if(month === 2 && day === 29 && !isLeap(nowTime.getFullYear())){ day = 28; } //得到今年的生日日期 var nowBirthday = new Date(nowTime.getFullYear(), month - 1, day); console.log(nowBirthday, nowTime); if(nowBirthday > nowTime){//若今年的生日没有过,则减一岁 age--; } return age; } console.log(getAge(2000, 2, 29)); </script> </body> </html>