Question

我的问题是如何使用Javascript从日期输入类型中获取年龄，并在Html中显示。

我希望用户能够从日期输入类型中选择出生日期，然后将其输入到我可以使用的“bday”ID中然后用来计算年龄，并将其填入'resultBday'元素ID。

例如：
当用户选择“1990年1月15日”时，我希望它在innerHtml中显示“24岁”。

这就是我目前所拥有的：

HTML：

<p id="resultBday"></p>
<input type="date" name="bday" id="bday" onchange="submitBday()">

JS：

function submitBday () {
    var Q4A = "Your birthday is: "
    var Bday = document.getElementById('bday').value;
    Q4A += Bday;

    var theBday = document.getElementById('resultBday');
    theBday.innerHTML = Q4A;
}

Answer 1

function submitBday() {
    var Q4A = "Your birthday is: ";
    var Bdate = document.getElementById('bday').value;
    var Bday = +new Date(Bdate);
    Q4A += Bdate + ". You are " + ~~ ((Date.now() - Bday) / (31557600000));
    var theBday = document.getElementById('resultBday');
    theBday.innerHTML = Q4A;
}

jsFiddle example

Answer 2

一种简单的计算年份和月份的方法如下：

HTML：

<label>Your Date of Birth <label>
<input type="date" name="birthday" id='birthday' onchange="ageCount()"> 

<p id="demo">age shows here</p>

JavaScript

<script>
  function ageCount() {
    var now =new Date();                            //getting current date
    var currentY= now.getFullYear();                //extracting year from the date
    var currentM= now.getMonth();                   //extracting month from the date
      
    var dobget =document.getElementById("birthday").value; //getting user input
    var dob= new Date(dobget);                             //formatting input as date
    var prevY= dob.getFullYear();                          //extracting year from input date
    var prevM= dob.getMonth();                             //extracting month from input date
      
    var ageY =currentY - prevY;
    var ageM =Math.abs(currentM- prevM);          //converting any negative value to positive
      
    document.getElementById('demo').innerHTML = ageY +' years ' + ageM +' months';
    }
    
    </script>

如何使用html＆amp; amp;输入类型'date'获取'age' JS？

2 个答案: