bdhmProtocol 解释

<script type="text/javascript">var _bdhmProtocol = (("https:" == document.location.protocol) ? " https://" : " http://");document.write(unescape("%3Cscript src='" + _bdhmProtocol + "hm.baidu.com/h.js%3F6ddbaad1111bb58e0d0fa94febfdad7c' type='text/javascript'%3E%3C/script%3E"));</script>

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var _bdhmProtocol = (("https:" == document.location.protocol) ? " https://" : " http://");根据当前页面所使用的传输协议来定义变量_bdhmProtocol 值，如果是https协议，则_bdhmProtocol="https://"，否则＝"http://"document.write(unescape("%3Cscript src='" + _bdhmProtocol + "hm.baidu.com/h.js%3F6ddbaad1111bb58e0d0fa94febfdad7c' type='text/javascript'%3E%3C/script%3E"));

这个是百度的站点统计代码。

输出一个js调用代码，结果为：

<script src='http://hm.baidu.com/h.js?6ddbaad1111bb58e0d0fa94febfdad7c' type='text/javascript'></script>

或者

<script src='https://hm.baidu.com/h.js?6ddbaad1111bb58e0d0fa94febfdad7c' type='text/javascript'></script>