function GetAge(identityCard) { var len = (identityCard + "").length; if (len == 0) { return 0; } else { if ((len != 15) && (len != 18))//身份证号码只能为15位或18位其它不合法 { return 0; } } var 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) { strBirthday = "19" + identityCard.substr(6, 2) + "/" + identityCard.substr(8, 2) + "/" + identityCard.substr(10, 2); } //时间字符串里,必须是“/” var birthDate = new Date(strBirthday); var nowDateTime = new Date(); var 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; }
来源:https://www.cnblogs.com/qdjl/p/12572593.html