如果当前日期是用户的生日，如何验证年龄并发出警报? [英] How to validate age and alert if the current date is the user's birthday?

问题描述

好的，我是Java语言的新手(大约2个月前开始在我的计算机课上学习)，我正在做一项作业，该作业需要一个包含出生日期的表格(每个日期/月份/年份分别在下拉菜单)，我需要能够:

Okay, I'm very new to Javascript (I started about 2 months ago in my computer's class) and I'm doing an assignment that requires a form that includes date of birth (with day/month/year each in a dropdown) and I need to be able to:

a)确认用户已年满18岁，如果没有，请发送警报.

a) Confirm that the user is over 18 and send an alert if not.

和;

b)如果当前日期是用户的生日，则提供生日快乐"消息

b) Provide a "happy birthday" message if the current day is the user's birthday

我一直在不懈地寻找解决方案，但找不到我能理解的解决方案.这是到目前为止我得到的:

I've searched tirelessly for a solution but I can't find one that I understand. This is what I've got so far:

    <form name="contest">
    Date of Birth:
    Year: <select name="year">
            <option></option>
            <option>2015</option>
            <option>2014</option>
            <option>2013</option>
            <option>2012</option>
            <option>2011</option>
            <option>2010</option>
            <option>2009</option>
            <option>2008</option>
            <option>2007</option>
            <option>2006</option>
            <option>2005</option>
            <option>2004</option>
            <option>2003</option>
            <option>2002</option>
            <option>2001</option>
            <option>2000</option>
            <option>1999</option>
            <option>1998</option>
            <option>1997</option>
            <option>1996</option>
            <option>1995</option>
            <option>1994</option>
            <option>1993</option>
            <option>1992</option>
            <option>1991</option>
            <option>1990</option>
        </select>
    Month: <select name="month">
            <option></option>
            <option value="jan">January</option>
            <option value="feb">February</option>
            <option value="mar">March</option>
            <option value="apr">April</option>
            <option value="may">May</option>
            <option value="jun">June</option>
            <option value="jul">July</option>
            <option value="aug">August</option>
            <option value="sep">September</option>
            <option value="oct">October</option>
            <option value="nov">November</option>
            <option value="dec">December</option>
        </select>
    Day: <select name="day">
            <option></option>
            <option>01</option>
            <option>02</option>
            <option>03</option>
            <option>04</option>
            <option>05</option>
            <option>06</option>
            <option>07</option>
            <option>08</option>
            <option>09</option>
            <option>10</option>
            <option>11</option>
            <option>12</option>
            <option>13</option>
            <option>14</option>
            <option>15</option>
            <option>16</option>
            <option>17</option>
            <option>18</option>
            <option>19</option>
            <option>20</option>
            <option>21</option>
            <option>22</option>
            <option>23</option>
            <option>24</option>
            <option>25</option>
            <option>26</option>
            <option>27</option>
            <option>28</option>
            <option>29</option>
            <option>30</option>
            <option>31</option>
        </select>

    <input type="button" name="" onClick="checkInput(this.form)" value="Submit"/>
    <input type="reset"/>
</form>

任何帮助将不胜感激！谢谢:)

Any help would be greatly appreciated! Thanks :)

推荐答案

直接.

function checkInput()
{
  // get today's date.
  var today = new Date();
  today.setHours(0,0,0,0); // set time to start of day for comparison.

  // create a new date based on user input.
  var bdate = new Date(Date.parse( 
    document.querySelector('select[name="year"]').value + ' ' +
    document.querySelector('select[name="month"]').value + ' ' +
    document.querySelector('select[name="day"]').value
  ));
  today.setYear(0); // ignore year part of date.
  bdate.setYear(0); // ignore year part of date.

  if (today.valueOf() == bdate.valueOf())
  {
    alert('Happy Birthday');
  }
  else
  {
    alert('Merry Unbirthday.');
  }
}

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