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1.根据日期算年龄
function mymethod(birthday){
if(birthday){
var str = birthday
birthday=birthday.split('-');
// 新建日期对象
let date = new Date()
// 今天日期，数组，同 birthday
let today = [date.getFullYear(), date.getMonth() + 1, date.getDate()]
// 分别计算年月日差值
let age = today.map((val, index) => {
return val - birthday[index]
})
// 当天数为负数时，月减 1，天数加本月总天数
if (age[2] < 0) {
// 获取当月总天数的方法
let curMonth = new Date(today[0], today[1], 0)
age[1]--
age[2] += curMonth.getDate()
}
// 当月数为负数时，年减 1，月数加上 12
if (age[1] < 0) {
age[0]--
age[1] += 12
}
console.log('出生日期：' + str + " 岁数：" + age[0]+'岁'+age[1]+'月'+age[2]+'天');
}
}
mymethod('2020-12-06') // 出生日期：2020-12-06 岁数：1岁5月18天
2.根据年龄算日期
function myfunction(ageYear,ageMonth,ageDay){//根据年龄算日期
var subYear = parseInt(ageYear);
var subMonth = parseInt(ageMonth);
var subDay = parseInt(ageDay);
var now = new Date();
var nowYear = now.getFullYear();
var nowMonth = now.getMonth()+1;
var nowDay = now.getDate(); // 按照减法原理，先day相减，不够向month借；然后month相减，不够向year借；最后year相减。
var day = nowDay - subDay;
var month = nowMonth - subMonth;
var year = nowYear - subYear; // 检查是否溢出
if(day |