Sanu0074,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function(){
var arr = $.makeArray( $("tbody tr") );;
arr.sort(function(a, b) {
a = $(a).data('sort')!== void(0)? +$(a).data('sort'):-1 ;
b = $(b).data('sort')!== void(0)? +$(b).data('sort') : -1 ;
return b - a
});
$( arr ).prependTo("tbody");
alert($("body").html())
});
</script>
</head>
<body>
<table>
<tbody>
<tr>
<th>cell 1</th>
<th>cell 2</th>
</tr>
<tr data-sort="8">
<th>cell 1</th>
<th>cell 2</th>
</tr>
<tr data-sort="12">
<th>cell 1</th>
<th>cell 2</th>
</tr>
<tr data-sort="2">
<th>cell 1</th>
<th>cell 2</th>
</tr>
<tr data-sort="7">
<th>cell 1</th>
<th>cell 2</th>
</tr>
<tr data-sort="0">
<th>cell 1</th>
<th>cell 2</th>
</tr>
<tr data-sort="0">
<th>cell 1</th>
<th>cell 2</th>
</tr>
</tbody>
</table>
</body>
</html>