最近项目上有一个需要根据身份证获取老人周岁的功能，本以为当前年直接减去身份证的出生年就好了。结果测试提了过了生日就是+1岁，没过生日才是正确的。于是呼，哗哗的改代码。下面分别贴出java计算和js计算：
java计算
public Integer handleIdentityAge(String identity,Integer year,Integer month,Integer day){if(identity.length()<10){return 0;}Integer selectYear=Integer.valueOf(identity.substring(6,10));Integer selectMonth=Integer.valueOf(identity.substring(10,12));Integer selectDay = Integer.valueOf(identity.substring(12, 14));Integer yearMinus = year - selectYear;Integer monthMinus = month - selectMonth;Integer dayMinus = day - selectDay;Integer age = yearMinus;if(yearMinus<0){age = 0;}else if (yearMinus == 0) {age = 0;} else if (yearMinus > 0) {if (monthMinus == 0) {if (dayMinus < 0) {age = age - 1;}} else if (monthMinus > 0) {age = age + 1;}}return age;}
js计算
function calculatingAge (identity) {if(identity.length < 10) {return "";}debuggervar birthYear = identity.substr(6, 4);var birthMonth = identity.substr(10, 2);var birthDay = identity.substr(12, 2);var d = new Date();var nowYear = d.getFullYear();var nowMonth = d.getMonth() + 1;var nowDay = d.getDate();let returnAge = 0;let result = 0;//1997-11-16if(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;}
以上两种方式都是根据身份证号计算周岁，避免重复造轮子，可以直接复制使用。
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