要获取当前URL，可以使用attr()method或window.location。
<html>
<head>
<title>url</title>
<script src="../../Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$("button").click(function () {
alert($(location).attr('href'));
alert(window.location);
});
});
</script>
</head>
<body>
<div>
<button type="button" id="btn">Display URL</button>
</div>
</body>
</html>