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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。。。。。。
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