get id value jquery

1$(this).attr('id')

1var myId = $(this).attr('id');
2alert( myId );

1	var rid = $(this).attr('id');	//for dynamically created elements

1alert($(this).attr('id'))

1var myId = $("#test").prop("id");
2

1$(document).ready(function(){
2  $("button").click(function(){
3  var myid = $( "#old" ).html()
4    $("#some").html(myid);
5  });
6});