JavaScript年龄计算器-优快云博客

本文链接：https://blog.youkuaiyun.com/u013746071/article/details/90903997

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    <script language=javascript>
        function getAge(strAge) {
            var birArr = strAge.split("-");
            var birYear = birArr[0];
            var birMonth = birArr[1];
            var birDay = birArr[2];

            d = new Date();
            var nowYear = d.getFullYear();
            var nowMonth = d.getMonth() + 1; //记得加1
            var nowDay = d.getDate();
            var returnAge;

            if (birArr == null) {
                return false
            };
            var d = new Date(birYear, birMonth - 1, birDay);
            if (d.getFullYear() == birYear && (d.getMonth() + 1) == birMonth && d.getDate() == birDay) {
                if (nowYear == birYear) {
                    returnAge = 0; // 
                } else {
                    var ageDiff = nowYear - birYear; // 
                    if (ageDiff > 0) {
                        if (nowMonth == birMonth) {
                            var dayDiff = nowDay - birDay; // 
                            if (dayDiff < 0) {
                                returnAge = ageDiff - 1;
                            } else {
                                returnAge = ageDiff;
                            }
                        } else {
                            var monthDiff = nowMonth - birMonth; // 
                            if (monthDiff < 0) {
                                returnAge = ageDiff - 1;
                            } else {
                                returnAge = ageDiff;
                            }
                        }
                    } else {
                        return  "出生日期晚于今天，数据有误"; //返回-1 表示出生日期输入错误 晚于今天
                    }
                }
                return returnAge;
            } else {
                return ("输入的日期格式错误！");
            }
        }
        //当前日期  2019-06-05
        console.log(getAge("2000-03-22")); //["1980", "03", "22"] ——————19岁
        console.log(getAge("2000-06-02")); //["1980", "06", "02"]——————19岁
        console.log(getAge("2000-06-12")); //["1980", "06", "12"]——————18岁
        console.log(getAge("2002-36-02")); //输入的日期格式错误！
        console.log(getAge("2022-02-02")); //出生日期晚于今天，数据有误
    </script>
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JS根据出生日期计算年龄