js通过身份证号获取出生日期，性别，年龄

 /*
    * 当type=1时获取出生日期,type=2时获取性别,type=3时获取年龄
    * */
    var idCard = '' //身份证号
    function IdCard(IdCard, type) {
        if (type === 1) {
            //获取出生日期
            let birthday = IdCard.substring(6, 10) + "-" + IdCard.substring(10, 12) + "-" + IdCard.substring(12, 14)
            return birthday
        }
        if (type === 2) {
            //获取性别
            if (parseInt(IdCard.substr(16, 1)) % 2 === 1) {
                return "男"
            } else {
                return "女"
            }
        }
        if (type === 3) {
            //获取年龄
            var ageDate = new Date()
            var month = ageDate.getMonth() + 1
            var day = ageDate.getDate()
            var age = ageDate.getFullYear() - IdCard.substring(6, 10) - 1
            if (IdCard.substring(10, 12) < month || IdCard.substring(10, 12) === month && IdCard.substring(12, 14) <= day) {
                age++
            }
            if (age <= 0) {
                age = 1
            }
            return age
        }
    }

    IdCard(idCard, 3)

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