博客

// 根据身份证获取年龄
const GetAge = function(identityCard) {
	let len = (identityCard + "").length;
	let strBirthday = "";
	if (len == 18) {
	//处理18位的身份证号码从号码中得到生日和性别代码
	strBirthday =
	 identityCard.substr(6, 4) +
	 "/" +
	 identityCard.substr(10, 2) +
	 "/" +
	 identityCard.substr(12, 2);
	}
	if (len == 15) {
	let birthdayValue = "";
	birthdayValue = identityCard.charAt(6) + identityCard.charAt(7);
	if (parseInt(birthdayValue) < 10) {
	 strBirthday =
	 "20" +
	 identityCard.substr(6, 2) +
	 "/" +
	 identityCard.substr(8, 2) +
	 "/" +
	 identityCard.substr(10, 2);
	} else {
	 strBirthday =
	 "19" +
	 identityCard.substr(6, 2) +
	 "/" +
	 identityCard.substr(8, 2) +
	 "/" +
	 identityCard.substr(10, 2);
	}
	}
	let birthDate = new Date(strBirthday);
	let nowDateTime = new Date();
	let age = nowDateTime.getFullYear() - birthDate.getFullYear();
	//再考虑月、天的因素;.getMonth()获取的是从0开始的，这里进行比较，不需要加1
	if (
	nowDateTime.getMonth() < birthDate.getMonth() ||
	(nowDateTime.getMonth() == birthDate.getMonth() &&
	 nowDateTime.getDate() < birthDate.getDate())
	) {
	age--;
	}
	return age;
 }