试试

setTimeout(function(){        

        //以下修改文本控件、数字控件的属性        

        $(".fr-texteditor").css({"background":"rgba(0,0,0,0)","color":"#c0c0c0"});//设置背景和字体颜色

        $(".fr-texteditor").css("border","none");//去除边框

        //以下修改下拉单选控件，下拉复选控件和日期控件的属性

        $(".fr-trigger-text.fr-border-box").css({"background":"rgba(0,0,0,0)"});//设置控件本身背景

        $(".fr-trigger-text").find("input").css({"background":"rgba(0,0,0,0)","color":"#c0c0c0"});//设置控件输入框背景和字体颜色

        $(".fr-trigger-text").css("border","none");//去除边框

      $(".fr-trigger-btn-up").css({"background":"rgba(0,0,0,0)","border":"none"});//设置控件右侧点击按钮        

},100)