The hash property refers to the anchor portion of the URL, including the hash symbol (#).
If the URL contains a pound sign (#), this returns the content after it (for example, http://www.java2s.com/index#section1 has a hash equal to "#section1").
<html>
<head>
<title> Using the hash property of the Location object</title>
</head>
<body>
<script language="JavaScript">
<!--
function show(){
alert(document.location.hash);
}
-->
</script>
<form name="form1">
Click the button to get the current location.hash
value of the following address:
<br>
http://www.java2s.com
<br><br>
<input type="button" name="getLoc" value="Get hash value" onClick='show()'>
<br>
</form>
</body>
</html>