Question

code:

<img src="image1.jpg" alt="This is 1 test.">

<img src="image2.jpg" alt="This is 2 test">

jquery code:

 alert($('img')[0].attr('alt'));

why there is not pop up a box, and shows This is 1 test.

Answer 1

To directly answer your question:

It doesn’t work because [0] returns a native DOM Element of the selector, which doesn’t have a method called .attr(). You need to use .eq(index), which basically extracts out the index‘th element of the elements represented by $(). Note that $() returns an array-like object and not an array per-se (thus [0] doesn’t work out of the box)