How to set and get Attributes in JQuery

Below code explains Setting and Getting attributes in JQuery.

var al = $("a#user").attr("href"); 

// obtaining href attribute value

$("a#user").attr("href", "http://www.google.com/");

// setting the href attribute to a new value

$("a#user").attr({
  alt: "The Famous Search Engine",
  href: "http://www.google.com/"
});
 // can set more than one attribute to new values