在JS事件里面怎么写CSS样式，修改下拉框选项的背景色，Js如下
setTimeout(function(){
$(".fr-trigger-text.fr-border-box").css({"background":"rgba(0,0,0,0)"});
$(".fr-trigger-text").find("input").css({"background":"rgba(0,0,0,0)","color":"#c0c0c0"});
$(".fr-trigger-text").css("border","none");
$(".fr-trigger-btn-up").css({"background":"rgba(0,0,0,0)","border":"none"});
$(".fr-combo-list").css({"background-color":"black"});
},200)
设置成黑色没反应
1min目标场景问卷
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