A simple JavaScript program that I wrote that will ask the user to give two numbers and then it will compute the difference of the two numbers and display the result in the screen.

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Program Listing

<html>
   <title>Difference of Two Numbers in JavaScript</title>
 <style type="text/css">

 body {

 	font-family: arial;
 	font-weight: bold;
 	font-size:15px;
 	 }
 
 form
{
  display: inline-block;
  background-color: lightblue;
  padding: 6px;
}

label{
  display: block;
  direction: rtl; 
}

input{
  direction: ltr; 
}

label::after{
  content: attr(data-text);
}
 </style>

<script language="JavaScript">

function Solve(){

a = parseInt(document.difference.val_1.value);
b = parseInt(document.difference.val_2.value);

if (a > b) {
  result = a - b;
} else {
  result = b - a;
}
document.difference.diff.value = (result);
}

function Clear() {
document.difference.val_1.value ="";
document.difference.val_2.value="";
document.difference.diff.value="";
document.difference.val_1.focus();
 }

</script>
<body>
<br>
<h3>Difference of Two Numbers in JavaScript</h3>
<form name="difference">
<label data-text="First Value">&nbsp;&nbsp;	
<input type="text" name="val_1" autofocus required>
</label>
<br />
<label data-text="Second Value">&nbsp;&nbsp;
<input type="text" name="val_2"required="">
</label>
<br/>
<label data-text="Difference">&nbsp;&nbsp;<input type="text" name="diff" >
</label>
<br /> <br>
<input type="button" value="Convert" title="Click here to solve." onclick="Solve()" />
<input type="button" value="Clear"  
title="Click here to clear the text box."
onclick="Clear()"/>
</form>
</body>
</html>