近期学习内容分享：   思路：利用css属性background，实现类似透明效果 CSS3：linear-gradient属性参考  https://blog.csdn.net/qq_29070549/article/details/124410257   类型一：下拉框+下拉复选框+下拉树（控件编辑前事件） setTimeout(function() { $(".bi-v.list-view-outer.bi-card.list-view-shadow").css({"background": "linear- gradient(180deg,rgba(0,145,255,0.049)0%,rgba(0,26,56,0.098)100%)","color":"white","font-size":'12px',"text-align":"center"}); //下拉列表背景，字体颜色大小 //180deg 向下渐变 linear-gradient(180deg,color1,color2....) }, 10)   类型二：时间控件（para点击事件） setTimeout(function() { $(".bi-v.list-view-outer.bi-card.list-view-shadow").css({"background":"linear-gradient(180deg,rgba(0,145,255,0.049)0%,rgba(0,26,56,0.098)100%)","color":"white","font-size":'12px',"text-align":"center"});//下拉列表背景，字体颜色大小 }, 10)     opacity：整体性透明度控制，文字效果也会同时变化 --https://blog.csdn.net/catascdd/article/details/129064820     好好学习，天天向上，欢迎分享与指正。。。。。。