缓存js

protected void Page_Load(object sender, EventArgs e)
        {
            var file = new List<string>
                           {
                               "js/jquery-1.7.2.min.js",
                               "js/pinyin.dict.src.js",
                               "js/pinyin.js"
                           };
            Response.Clear();
            Response.ContentType = "text/javascript";

            var last = new DateTime(1900, 1, 1);
            foreach (var script in file)
            {
                var fileinfo = new System.IO.FileInfo(Server.MapPath(script));
                var max = fileinfo.LastWriteTime;
                last = last > max ? last : max;
                Response.Write("\r\n//" + script + "(" + fileinfo.Length + ")\r\n");
                Response.Write(System.IO.File.ReadAllText(fileinfo.FullName));

            }

            if (last > DateTime.Now)
                last = DateTime.Now;
            //304缓存
            Response.Cache.SetETag(last.Ticks.ToString());
            Response.Cache.SetLastModified(last);
            Response.Cache.SetCacheability(HttpCacheability.Public);
            Response.Cache.SetMaxAge(new TimeSpan(7, 0, 0, 0));
            Response.Cache.SetSlidingExpiration(true);

            //gzip压缩
            Response.Filter = new System.IO.Compression.GZipStream(Response.Filter, System.IO.Compression.CompressionMode.Compress);
            Response.AppendHeader("Content-Encoding", "gzip");

            DateTime modified;
            //命中缓存
            if (Request.Headers["If-Modified-Since"] != null && DateTime.TryParse(Request.Headers["If-Modified-Since"], out modified) && modified.ToString() == last.ToString())
            {
                Response.StatusCode = 304;
                Response.StatusDescription = "Not Modified";

            }
            Response.End();
        }

在需要调用缓存JS页面

<script type="text/javascript" src="/mainJS.aspx"></script>

 

 

缓存主要是根据缓存中JS的最后更新时间.其中一个文件更新都会同意重新调用原
JS文件. 有时候更新上去刷新页面JS未能及时更新可能是.net的缓存机制.