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response.setHeader( "Pragma", "no-cache" );
response.addHeader( "Cache-Control", "must-revalidate" );
response.addHeader( "Cache-Control", "no-cache" );
response.addHeader( "Cache-Control", "no-store" );
response.setDateHeader("Expires", 0);
单纯的使用 xmlhttp.setRequestHeader("Cache-Control","no-cache")无效。
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原文地址:http://www.cnblogs.com/JAYIT/p/4468442.html