<html>
<head>
<base id="myBase">
<script language="JavaScript">
function function1() {
document.all.myBase.href= "http://www.java2s.com";
}
</script>
</head>
<body>
<a id="myAnchor" href="/index.htm" hreflang="en">www.java2s.com site</a>
<br><br>
<button onclick="function1();">Change the base URL</button>
<button onclick="alert(myAnchor.href);">Anchor</button>
<button onclick="alert(location.href);">Location</button>
<button onclick="alert(document.styleSheets(0).href);">style sheet</button>
<button onclick="alert(myAnchor.hreflang);">Language</button>
</body></html>
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