attr(String,Object)

attr(String key, Object value) returns jQuery
Set a single property to a value, on all matched elements.
Note that you can't set the name property of input elements in IE. Use $(html) or .append(html) or .html(html) to create elements on the fly including the name property.

Example:

Sets src attribute to all images.
$("img").attr("src","test.jpg");
HTML:
<img/>
Result:
<img src="test.jpg"/>