_g().getWidgetByCell("C3").$btn.parents("div.fr-btn-up").css("background","red")
--
刚才写错
也可以给按钮设置一个控件名:
_g().getWidgetByName("控件名").$btn.parents("div.fr-btn-up").css("background","red");
===
setTimeout(function(){
_g().getWidgetByCell("C3").$btn.parents("div.fr-btn-up").css("background","red");
},1000);