Question

I see some thing like

$(#content).children(".p:first");

call the first <p> tag, except first, Is there any other parameter? thanks.

exaple:

<div id="content">
<p>aaa</p>
<p>bbb</p>
<p>ccc</p>

use $(#content).children(".p:first"); echo

<div id="content">
<p>aaa</p>
</div>

Is there any $(#content).children(".p:second"); or $(#content).children(".p:last"); can be set?

Answer 1

Is there any $(#content).children(“.p:second”); or $(#content).children(“.p:last”); can be set?

:last already exists – see the documentation here.

:second is not there, but could be implemented the easy way:

$('p:first').next() or, with a custom selector:

$.expr[':'].second= function(
    objNode,
    intStackIndex,
    arrProperties,
    arrNodeStack
    ) {

    return intStackIndex == 1;
}

This now allows you to do $(‘element:second’). See the jsFiddle here: http://jsfiddle.net/6xY6D/