js监视文件是否已经传输到客户端

使用IFrame或者Frameset都可以监视是否文件已经传输到客户端了。

               var obj_IFrame = document.getElementById("detail");

               obj_IFrame.onreadystatechange = function() {

               if (obj_IFrame.readyState && (obj_IFrame.readyState == 'interactive' || obj_IFrame.readyState == 'complete') && obj_IFrame.src != "about:blank") {

                       endRequest();
                   }
               };