Access a property on the first matched element. This method makes it easy to retrieve a property value from the first matched element. If the element does not have an attribute with such a name, undefined is returned. The name of the property to access. Returns the src attribute from the first image in the document. <img src="test.jpg"/> $("img").attr("src"); test.jpg Set a key/value object as properties to all matched elements. This serves as the best way to set a large number of properties on all matched elements. Key/value pairs to set as object properties. Sets src and alt attributes to all images. <img/> $("img").attr({ src: "test.jpg", alt: "Test Image" }); <img src="test.jpg" alt="Test Image"/> 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. The name of the property to set. The value to set the property to. Sets src attribute to all images. <img/> $("img").attr("src","test.jpg"); <img src="test.jpg"/> Set a single property to a computed value, on all matched elements. Instead of supplying a string value as described [[DOM/Attributes#attr.28_key.2C_value_.29|above]], a function is provided that computes the value. The name of the property to set. A function returning the value to set. Scope: Current element, argument: Index of current element Sets title attribute from src attribute. <img src="test.jpg" /> $("img").attr("title", function() { return this.src }); <img src="test.jpg" title="test.jpg" /> Enumerate title attribute. <img title="pic" /><img title="pic" /><img title="pic" /> $("img").attr("title", function(index) { return this.title + (i + 1); }); <img title="pic1" /><img title="pic2" /><img title="pic3" />