如果CDNJS不可用，则加载本地 [英] Load local if CDNJS not available

问题描述

我在每个项目中都有几个JavaScript文件，目前正在使用CDNJS加载它们.

I have a couple of JavaScript files that I use on every single project and currently use CDNJS to load them.

但是，我试图查看是否有一种很好的方法来检查CDN是否可用，或者是否可以从CDN中找到文件.然后，当然，如果CDN上没有文件，我将在本地加载它们.

However, I was trying to see if there was a good way to check if the CDN is available, or if the files are available from the CDN. Then of course, if the files are not available on the CDN, I would load them locally.

以下是我当前使用的JS文件:

Here are the JS files I currently use:

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>window.jQuery || document.write('<script type="text/javascript" src="./scripts/jquery.min.js">\x3C/script>')</script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/retina.js/1.0.1/retina.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/respond.js/1.3.0/respond.js"></script>

<!--[if (gte IE 6)&(lte IE 8)]>
    <script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/selectivizr/1.0.2/selectivizr-min.js"></script>
<![endif]-->

如您所见，如果我有一个用于加载jQuery的备用，但没有其他任何文件的备用.

As you can see, if I have a fallback for loading jQuery, but not for any of the other files.

任何帮助将不胜感激！

推荐答案

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/retina.js/1.0.1/retina.js"></script>
<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/respond.js/1.3.0/respond.js"></script>
<script>
window.jQuery || document.write('<script type="text/javascript" src="./scripts/jquery.min.js">\x3C/script>')
window.Modernizr || document.write('<script type="text/javascript" src="./scripts/modernizr.min.js">\x3C/script>')
window.RetinaImage || document.write('<script type="text/javascript" src="./scripts/retina.js">\x3C/script>')
window.respond || document.write('<script type="text/javascript" src="./scripts/respond.js">\x3C/script>')
</script>

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