1.根据日期算年龄
mymethod(birthday){//根据日期算年龄if(birthday){birthday=birthday.split('-');// 新建日期对象let date = new Date();// 今天日期，数组，同 birthdaylet 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，天数加上月总天数if (age[2] < 0) {// 简单获取上个月总天数的方法，不会错let lastMonth = new Date(today[0], today[1], 0)age[1]--age[2] += lastMonth.getDate()}// 当月数为负数时，年减 1，月数加上 12if (age[1] < 0) {age[0]--age[1] += 12}console.log(age[0]+'岁'+age[1]+'月'+age[2]+'天');}}// mymethod(-08-08)
2.根据年龄算日期
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<=0){// 获得上月的天数 var lastMonth = nowMonth - 1; var lastMonthOfYear = nowYear; if(lastMonth<=0){lastMonth =lastMonth + 12 //(lastMonth + 12) % 12; lastMonthOfYear = lastMonthOfYear - 1;} day = day + new Date(lastMonthOfYear, lastMonth, 0).getDate(); month = month - 1; } if(month<=0){month =month + 12 //(month + 12) % 12; year--; } if(month<10){month='0'+month}if(day<10){day='0'+day}console.log(year+'-'+month+'-'+day);}// myfunction(1,10,20)
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