<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(function (){
var id= '#1';
$(id).html('12345')
})
</script>
</head>
<body>
<div id="1"></div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title></title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div id="1"></div>
<script type="text/javascript">
var id= '#1';
$(id).html('12345');
</script>
</body>
</html>