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html资源地址 src="// 开头_html/css_WEB-ITnose

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Release： 2016-06-24 11:26:53
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如果浏览器当前使用的是https协议，那么就加载https协议的脚本，否则使用http，这保证了页面所有资源使用同一协议。其实是有人将其做为规范来实践的。另外包括图片地址，CSS中的background地址都可以省略协议名。在script标签上使用没有兼容性问题，但在link上或者@import上这样写IE下会有问题。更多请参考：http://www.paulirish.com/2010/the-protocol-relative-url/
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