控制内嵌页面高度

<div class="jp_sth_cxt jp_tch_mc">
                        <h3 class="jp_modal_title">教师评教分析表</h3>
                        <a class="btn btn-success jp_btn_download jp_btn_download_rank" href="javascript:;">下载报告</a>
                        <iframe src="" id="frame_jp_rank" class="jp-iframe frame_jp_rank" width="100%" frameborder="no" border="0" scrolling="auto"></iframe>
                    </div>

 $(".frame_jp_rank").load(function(){
                            $('.jp_btn_download_rank').attr('href', '../../jp100/anly/'+schId+'/'+epId+'/xls/tbl1000.do'+param);
                           // var mainheight = $(this).contents().find("body").height()+30;
                            //$(this).height(mainheight);
                            $(this).css({"min-height":"400px","max-height":"800px"});
                        });