| 在   head   区内加入去除缓存的代码: 禁用客户端缓存
 HTML
 <META   HTTP-EQUIV="pragma"   CONTENT="no-cache">
 <META   HTTP-EQUIV="Cache-Control"   CONTENT="no-cache,   must-revalidate">
 <META   HTTP-EQUIV="expires"   CONTENT="Mon,   23   Jan   1978   20:52:30   GMT">
 ASP
 <%
 Response.Expires   =   -1
 Response.ExpiresAbsolute   =   Now()   -   1
 Response.cachecontrol   =   "no-cache"
 %>
 PHP
 header("Expires:   Mon,   26   Jul   1997   05:00:00   GMT");
 header("Cache-Control:   no-cache,   must-revalidate");
 header("Pragma:   no-cache");
 JSP
 response.setHeader("Pragma","No-Cache");
 response.setHeader("Cache-Control","No-Cache");
 response.setDateHeader("Expires",   0);
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