To get the port number part of the href attribute of an area in JavaScript, use the port property.
Example
You can try to run the following code to get the port number. If the port number is the default 80, then some browsers will give the result 0 or nothing (blank) −
<!DOCTYPE html>
<html>
<body>
<img src = "/images/html.gif" alt = "HTML Map" border = "0" usemap = "#html"/>
<map name = "html">
<area id="myarea" shape = "circle" coords = "154,150,59"
href = "about.htm?id=company" alt = "Team" target = "_self" >
</map>
<script>
var x = document.getElementById("myarea").port;
document.write("<br>Port Number: "+x);
</script>
</body>
</html>