jqmobi 在PHONEGAP的调试中样式全是黑色的了？

  $.ui.ready(
                        function () {
                         
                          $("#afui").get(0).className='ios7'; 
                    //  $.ui.removeFooterMenu();
                    $("#btnLogin").bind("click", loginFun);
                  //$.ui.backButtonText = "返回";
                    
                }
        );