$(this).attr( id ) in jquery code example

Example 1: jquery attr

$( some_item ).attr( "id", "some-id" );
// for setting multiple attributes, it's similar to the css() property. However, quotes are not always required for attr()
$( some_item ).attr({
  id: "some-id",
  // or others.
  title: "Opens in a new window",
  // attributes which contain dash(-), should be covered in quotes.
  "data-value": "internal link"
});

Example 2: what $this.attr('id')

No, they're not exactly the same.
They'll both return the element's ID, but if the element has no ID, then this.id will return a blank string while $(this).attr("id") will return undefined.

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