[英]Age Calculator in Javascript
我有这个代码,这个代码必须能够计算用户的年龄,它必须显示在提供的文本框中,如果用户更改了他的出生日期,年龄必须更改。 但此代码不起作用,它不会在文本框中显示计算的年龄。
<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>
下面是在 JavaScript 中完成年龄计算的外观:
<body onload="getAge()"> <h1 id="age" ></h1> <script> function calculateAge(dob) { var now = new Date(); var dob = new Date(dob); var year=now.getYear()-dob.getYear(); var month=now.getMonth()-dob.getMonth(); if(month<0){ month=now.getMonth()+12-dob.getMonth(); year=year-1; } var day=now.getDate()-dob.getDate(); if(day<0){ var monthNumber=dob.getMonth(); var fullDate=getFullDate(monthNumber); day=now.getDate()+fullDate-dob.getDate(); month=month-1; } return year+" Years, "+month+" Months, "+day+" Days!"; }; function getFullDate(x){ switch(x){ case 0: return 31; break; case 1: return 28; break; case 2: return 31; break; case 3: return 30; break; case 4: return 31; break; case 5: return 30; break; case 6: return 31; break; case 7: return 31; break; case 8: return 30; break; case 9: return 31; break; case 10: return 30; break; case 11: return 31; } } function getAge(){ x=prompt("Please Enter Your Date of Birth in format (yyyy-mm-dd): ",""); x=new Date(x); document.getElementById("age").innerHTML="Your age is: "+calculateAge(x); } </script> </body>
试试这个..
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));
}
您的代码中存在三个错误,请参阅下面的内联注释:
第一个选项的年份值是 991 而不是 1991,可能会导致您认为计算错误。
包含分配给出生变量的日期的字符串必须作为参数传递给 Date() 函数以创建一个日期对象,该对象可以与它下面的当前日期对象一起使用。
变量milliDay 已声明,然后您尝试使用milliday(错误的情况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>
假设选择了第一个选项,这将返回以下值:
年龄:0.057534246575342465
计算年龄:21
您是否只是想以年、月、日为单位计算年龄?
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