<a id="btnSave" href="javascript:void(0)" class="easyui-linkbutton" data-options="disabled:false" onclick="backsave(closedialog)">保存</a>

 
function save() {
                var isValid = $('#filemanage').form('validate'); 
                if(isValid){
                    if(checkacc()){
                        $("#filemanage").attr("action",'${requestContext.contextPath}/management/filemanage/create');
                        $("#filemanage").submit();
                    }
                }
            } 
            function closedialog(){
                $(parent).domain('closeDialog');
            }
            function backsave(callback) { 
                save();
                callback();
            }  
function checkacc(){
                var postfix = filemanage.file.value.substring(filemanage.file.value.lastIndexOf(".")+1);
                 if(postfix!=""){
                      if(!(postfix == "ktr"||postfix == "ktb"))   
                      {   
                          alert('文件类型不正确，请选择.ktr或者.ktb文件 ！');   
                          document.getElementById('file').value="";
                          document.getElementById('file').focus();
                          return false;
                      }
                      else{
                          return true;
                      }
                 } 
            }