在哪里学习AJAX [关闭]

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                    <p class="mb0 mt6">Closed <span title="2014-03-04 10:25:46Z" class="relativetime">6 years ago</span>.</p>
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Yes, I know that there are some similar questions here, but they do not the same as mine.

I know about such a great resources such as code-school and code-academy where you may get some PHP and JS skills via coding right inside the website.

But is there any similar thing to learn AJAX? I am familiar with JS and with jQuery as well, but would like to learn AJAX too.

I want to learn AJAX especially for interacting with PHP (I am familiar with PHP too).

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