如何将twitter-bootstrap cdn回退到本地副本 [英] how to fallback twitter-bootstrap cdn to local copy

问题描述

有很多发布有关如何通过检查全局变量 JQuery 的存在来将JQuery CDN回退到本地副本的问题。

There are many posts about how to fallback a JQuery CDN to a local copy by checking the existance of the global variable JQuery.

我的问题是，如何对twitter-bootstrap做同样的事情？是否在bootstrap中定义了一个变量，以便我可以检查以确保CDN可用？

My question is , how to do the same to twitter-bootstrap ? Is there a variable defined in bootstrap so that I can check to make sure the CDN is available ?

BTW，我使用 netdna.bootstrapcdn.com 作为我的bootstrap CDN

BTW, I use netdna.bootstrapcdn.com as my bootstrap CDN

推荐答案

我没有看到twitter-bootstrap为此目的暴露的特定变量，他们不会将所有插件附加到jQuery UI的命名空间。你的下一个最好的选择是测试其中一个bootstrap插件。也许是这样的：

I didn't see a specific variable that twitter-bootstrap exposes for this purpose and they don't attach all of their plugins to a namespace a la jQuery UI. Your next best bet is to test for one of the bootstrap plugins. Perhaps something like this:

if(typeof($.fn.modal) === 'undefined') {
    //load bootstrap locally
}

不幸的是，它很脆弱。如果重命名或删除模态插件，则此检查将始终失败。

The unfortunate thing about this is that it is brittle. If the modal plugin is ever renamed or removed this check would always fail.

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