setTimeout(function() {

 $(".fr-label").css({

  "background": "#fffff",

  "color": "#00000"

 });

 //以下修改文本控件、数字控件的属性 

 $(".fr-texteditor").css({

  "background": "#060a2a",

  "color": "#ffffff"

 }); //设置背景和字体颜色

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

 $(".fr-trigger-text.fr-border-box").css({

  "background": "#060a2a"

 }); //设置控件本身背景

 $(".fr-trigger-text").find("input").css({

  "background": "rgba(0,0,0,0)",

  "color": "#ffffff"

 }); //设置控件输入框背景和字体颜色

 $(".fr-trigger-text").css("border", "0.5px solid #75c0da"); //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)

初始化后$("#fr-btn-BT1").css({"background":"blue"})   //BT1为按钮名称