Google CDN的jQuery UI的后备 [英] Fallback for jQuery UI from google CDN

问题描述

如果从Google CDN抓取失败，Html5 Boilerplate使用以下技巧来回退到本地存储的JQuery:

<script>!window.jQuery && document.write(unescape('%3Cscript src="js/libs/jquery-1.4.2.js"%3E%3C/script%3E'))</script>

您将如何实施此技巧以对jQuery UI执行相同的技巧?

解决方案

<script type="text/javascript">!window.jQuery.ui && document.write(unescape('%3Cscript src="path to jquery UI lib'))</script>

在对jQuery本身进行后备操作后执行此操作.

或者(如果您不喜欢！)

<script type="text/javascript">(window.jQuery.ui === /* notice the === */ undefined) && document.write( /* ... */)</script>

检测未定义的对象属性

Html5 Boilerplate uses the following trick for fallback to locally stored JQuery if grabbing it from Google CDN fails:

<script>!window.jQuery && document.write(unescape('%3Cscript src="js/libs/jquery-1.4.2.js"%3E%3C/script%3E'))</script>

How would you implement this trick to perform the same trick for jQuery UI?

解决方案

<script type="text/javascript">!window.jQuery.ui && document.write(unescape('%3Cscript src="path to jquery UI lib'))</script>

Do this after the fallback for jQuery itself.

Or (if you don't like the !)

<script type="text/javascript">(window.jQuery.ui === /* notice the === */ undefined) && document.write( /* ... */)</script>

Detecting an undefined object property

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