1. static: it does not disappear (from the stack) when a function is completed, and its value is retained
  2. cache: Last-Modified, Expires, Cache-Control and Age Date
  3. 301 Moved Permanently: The page has been moved, resulting in a “location” redirect.
  4. 301, Content-Encoding, cache, Content-Encoding + Content-Type, Content-Type, Server, Connection, 301, Content-Encoding看charset+Content-Type, Accept.
  5. id 选择器以 "#" 来定义。

  6. .isGeneric .contentWrap{margin:20px 20px 0;}
    Declares two classes that, when BOTH applied, reset the margins.

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