javascript include 开头的双斜线
我一直在查看 html5 样板并注意到 jquery include url 以双斜杠开头。 url 是 //ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js
为什么 http: 丢失了？
I have been looking at the html5 boilerplate and noticed that the jquery include url starts with a double slash. The url is //ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js
Why is the http: missing?
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我讨厌用链接回答，但这解释了它 - http://paulirish.com/2010 /the-protocol-relative-url/
使用协议相对 URL（如“//mydomain/myresource”）将确保内容将通过与托管页面相同的方案提供。如果您曾经使用 FILE:// 然后使用一些远程位置，则可能会使测试变得更加尴尬，因为它们显然会解析回 FILE。尽管如此，它确实解决了因不使用它而可能导致的混合不安全/安全内容消息。
I hate answering with a link but this explains it - http://paulirish.com/2010/the-protocol-relative-url/
Using a protocol relative URL like "//mydomain/myresource" will ensure that the content will be served via the same scheme as the hosting page. It can make testing a bit more awkward if you ever use FILE:// and then some remote locations as they will obviously resolve back to FILE. Never the less it does resolve the mixed insecure/secure content messages you can cause by not using it.
因此，如果 .html 是通过 HTTPS 访问的；该页面不会有任何不安全的脚本。
So that if the .html is accessed via HTTPS; the page will not have any unsecured script.