fgui 更换按钮皮肤和自定义皮肤

 

this.topMc=this;

this.shitingBtn=this.topMc.getChild("shitingBtn");
this.shitingBtn.icon="ui://dyznd17/game2_btn0001";
this.shitingBtn.getChild("iconDown").asLoader.url="ui://dyznd17/game2_btn0002";