Use the document.links property in JavaScript to get the number of links in a document. These links can be from <area> and <a> i.e. tags with href attribute.
Example
You can try to run the following code to implement document.links property in JavaScript.
<!DOCTYPE html>
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<p>
<a href="/java/index.htm">Java</a><br>
<a href="/php/index.htm">PHP</a><br>
<a href="/ruby/index.htm">Ruby</a><br>
<a href="/wordpress/index.htm">WordPress</a>
</p>
<script>
var num = document.links.length;
document.write("How many links? "+num);
</script>
</body>
</html>