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1、加個(gè)隨機數
      xmlHttp.open("GET", "ajax.asp?now=" + new Date().getTime(), true);

2、在要異步獲取的asp頁(yè)面中寫(xiě)一段禁止緩存的代碼：
      Response.Buffer =True
      Response.ExpiresAbsolute =Now() - 1
      Response.Expires=0
      Response.CacheControl="no-cache"

3、在ajax發(fā)送請求前加上x(chóng)mlHTTP.setRequestHeader("If-Modified-Since","0");可以禁止緩存
      xmlHTTP.open("get", URL, true);
      xmlHTTP.onreadystatechange = callHTML;
      xmlHTTP.setRequestHeader("If-Modified-Since","0");
      xmlHTTP.send();  

4、header(”Cache-Control: no-cache, must-revalidate”);