A few examples of working element attributes in jQuery.

// Setting Single Attribute
$("img").attr("src", "/images/banner.jpg");

// Setting Single Attribute (with function)
$("div").attr("id", function(arr) {
  return "div-id" + arr;
});

// Setting Multiple Attributes
$("img").attr({
  src: "/images/banner.jpg",
  title: "banner",
  alt: "banner"
});

// Getting Attribute
var $source = $("img").attr("src");