使用Javascript的年齡計算器

Question

我有此代碼，此代碼必須能夠計算用戶的年齡，並且必須在提供的文本框中顯示，並且如果用戶更改其出生日期，則年齡必須更改。 但此代碼不起作用，它不會在文本框中顯示計算的年齡。

<input name= "date" type="text" readonly="readonly" /> 

<select id="Ultra" onchange="run()"> 
<option value="11/15/991">1991-11-15</option> 
<option value="10/23/1992">1992-10-23</option> 
</select><br><br> 
TextBox1<br> 
<input type="text" id="srt" placeholder="get value on option select" readonly="readonly"><br> 
<script type="text/javascript"> 
function run() { 
    var birth = document.getElementById("Ultra").value; 
    var check = new Date(); 
    var milliDay = 1000 * 60 * 60 * 24; 

    var AgeinDay = (check - birth)/milliday; 
    var ComputAge = Math.floor(AgeinDay/365); 
    var age = ComputAge/365; 
    document.getElementById("srt").value = age; 
} 
</script> 

Answer 1

試試這個..

function run() { 
    var birth = new Date(document.getElementById("Ultra").value); 
    var curr = new Date(); 
    var diff = curr.getTime() - birth.getTime(); 
    document.getElementById("srt").value = Math.floor(diff/(1000 * 60 * 60 * 24 * 365.25)); 
} 

Answer 2

有代碼中的三個錯誤，請評論下面內嵌：

第一選項的年份值是991，而不是1991年，可能會引起你認爲計算是錯誤的。

包含正在分配給出生變量的日期的字符串必須作爲參數傳遞給Date（）函數以創建可與當前日期對象一起使用的日期對象。

變量milliDay被聲明，那麼你試圖使用milliday（錯誤的情況D）。

<input name= "date" type="text" readonly="readonly" /> 

<select id="Ultra" onchange="run()"> 
<option value="11/15/1991">1991-11-15</option> <!-- year value was 991 instead of 1991, might cause you to think the calculation is wrong --> 
<option value="10/23/1992">1992-10-23</option> 
</select><br><br> 
TextBox1<br> 
<input type="text" id="srt" placeholder="get value on option select" readonly="readonly"><br> 
<script type="text/javascript"> 
function run() { 
    var birth = new Date(document.getElementById("Ultra").value); //string containing date has to be passed as parameter to Date() function to create a date object that can be used with the current date object below 
    var check = new Date(); 
    var milliDay = 1000 * 60 * 60 * 24; 

    var AgeinDay = (check - birth)/milliDay; //variable here was milliday all small case, declared above as milliDay with a capital D 
    var ComputAge = Math.floor(AgeinDay/365); 
    var age = ComputAge/365; 
    document.getElementById("srt").value = age; 
} 
</script> 

這將返回假設第一個選項下面的值選擇：

年齡：0.057534246575342465

ComputAge：21

你只是想獲得的年齡裏，或幾個月，幾個小時呢？