提交iframe页面中的表单

function getIframeDoc(id){
            var doc;
            if
(document.all){//IE
                doc = document.frames[id].document;

            }else{//Firefox    
                doc =
document.getElementById(id).contentDocument;
            }
           
return doc;
        }
        function submitB(){
            var doc
= getIframeDoc("frameUpload");
           
doc.getElementById("formUpload").submit();
        }