js跨域post请求

 function funPostBack(srvMethod){
         /*
         var contentNR=$(document.getElementById("reportFrame").contentWindow.document).find("#content-container").html();
          contentNR=$("#x").text(contentNR).html();
         contentNR=contentNR.substring(0,400000);
         if(exec_obj==null){
             exec_obj = document.createElement('iframe');
             exec_obj.name = 'tmp_frame';
             exec_obj.src = postbackUrl+"?parms="+contentNR;
             exec_obj.style.display = 'none';
             document.body.appendChild(exec_obj);
         }else{
             exec_obj.src = postbackUrl+"?parms="+contentNR;
         }*/

         var contentNR=$(document.getElementById("reportFrame").contentWindow.document).find("#content-container div.pageContentDIV.contentDIV").html();
         if(document.getElementById("SMAL")!=null)
         {
             document.getElementById("SMAL").remove();//首先删除
         }
         var form ="<form action='"+postbackUrl+"' method='post'>" +
                 "<input type='hidden' name='parms' value=''/> " +
                 "<input type='hidden' name='srvMethod' value=''/> " +
                 "</form> ";
         $("body").append("<iframe id='SMAL' name='SMAL' style='display: none'></iframe>");//载入iframe
         $( "#SMAL" ).contents().find('body').html(form);//将form表单塞入iframe;
         $( "#SMAL" ).contents().find("form input[name='parms']").val(contentNR);
         $( "#SMAL" ).contents().find("form input[name='method']").val(srvMethod);
         $( "#SMAL" ).contents().find('form').submit();
     }