AssignOper.html

<html>
<head>
    <body>
    <script type="text/javascript">
        var num= 5;
        num +=20;
// Here we are initially declaring num=5 but after by using += operator we are adding 20 to intial value        
        document.writeln(num);
        
        var sub =20;
        sub -= 5;
//// Here we are initially declaring sub=20 but after by using -= operator we are subtracting 5 from intial valu        
         document.writeln(sub);
  
     var number = 1;
        number +=19;
        number /= 10;
        number *= 5;
        number %= 4;
        
                document.writeln(number);
        
        </script>
    </body>
    </head>
        </html>