我有一个很长的列表，其中包含一个jQuery Mobile选择菜单小部件，该小部件将作为弹出窗口打开。默认情况下，弹出窗口会以纯白色背景打开（如果我在import org.apache.spark.SparkContext
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.functions.{unix_timestamp, year}
val sc: SparkContext = ??? // I consider that you are able to create both your SparkContext and SQLContext alone
val sqlContext: SQLContext = ???
import sqlContext.implicits._ // needed to use implicits like .toDF
val data = Seq(
"10.1515/cipms-2015-0089 2016-06-09T18:29:46.000046+01:00",
"10.1515/cipms-2015-0089 2016-06-09T18:29:46.000046+01:00",
"10.1007/s13595-016-0548-3 2015-06-08T17:01:10.000010+01:00")
// data: Seq[String] = List(10.1515/cipms-2015-0089 2016-06-09T18:29:46.000046+01:00, 10.1515/cipms-2015-0089 2016-06-09T18:29:46.000046+01:00, 10.1007/s13595-016-0548-3 2015-06-08T17:01:10.000010+01:00)
val df = sc.parallelize(data).map(_.split("\\s+") match {
case Array(doi, time) => (doi, time)
}).toDF("doi", "timestamp").withColumn("timestamp", unix_timestamp($"timestamp", "yyyy-MM-dd'T'hh:mm:ss").cast("timestamp"))
// df: org.apache.spark.sql.DataFrame = [doi: string, timestamp: timestamp]
df.groupBy(year($"timestamp").as("year")).count.show
// +----+-----+
// |year|count|
// +----+-----+
// |2015| 1|
// |2016| 2|
// +----+-----+
标记中明确设置了data-overlay-theme=a），并且如果我将此属性更改为<select>，则会打开一个实体黑色背景。在我的网站的其他地方，我使用带有data-overlay-theme=b的jQuery弹出窗口小部件，背景是不透明的黑色（可能是50％）。
有没有办法让select菜单小部件弹出窗口的背景与弹出窗口小部件具有相同的背景？