我有轮播图片滑块，但无法正常工作

Question

我正试图在BigDecimal a = new BigDecimal("0.25"); a = a.setScale(3, BigDecimal.ROUND_HALF_EVEN); 的帮助下显示动态图像滑块，但是它不起作用。

我的代码：

carousel slider

我不知道自己的代码哪里错了。

Answer 1

您需要检查import java.time.format.DateTimeFormatter; import java.time._ import scala.util.parsing.combinator._ val r = "[[0_busswvan, 24.0, 2019-09-05 20:15:33],[05f9acb08d7c11e89e8fede614b72917, 20.0, 2019-09-05 14:06:32], [0_h2qbu9h3, 28.0, 2019-09-05 14:01:20],[2_busswvan, 24.0, 2019-09-05 20:15:33],[05f9acb08d7c11e89e8fede614b72917, 25.0, 2019-08-12 14:06:32], [1442qbu9h3, 28.0, 2019-09-05 14:01:20]]" object Parser extends RegexParsers { val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss") def text: Parser[String] = """\w+""".r //parser for text def number: Parser[Double] = """\d+(\.\d*)?""".r ^^ { _.toDouble } //parser for numbers def datetime: Parser[LocalDateTime] = """\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}""".r ^^ { p => LocalDateTime.from(formatter.parse(p)) } //parser for date def glue: Parser[String] = """\w*,\w*""".r //parser for comma separators def term : Parser[(String, Double, LocalDateTime)] = "[" ~ text ~ ", " ~ number ~ ", " ~ datetime ~ "]" ~ opt(glue) ^^ { //parser for matching whole sublist case _ ~ text ~ _ ~ number ~ _ ~ datetime ~ _ ~ _ => { (text, number, datetime) } } def expr : Parser[List[(String, Double, LocalDateTime)]] = "[" ~> rep(term) <~ "]" //parser for whole list containing arbitrary number of sublist def apply(input: String): List[Any] = parseAll(expr, input) match { case Success(result, _) => result case failure : NoSuccess => scala.sys.error(failure.msg) } } println(Parser(r)) //List((0_busswvan,24.0,2019-09-05T20:15:33), (05f9acb08d7c11e89e8fede614b72917,20.0,2019-09-05T14:06:32), (0_h2qbu9h3,28.0,2019-09-05T14:01:20), (2_busswvan,24.0,2019-09-05T20:15:33), (05f9acb08d7c11e89e8fede614b72917,25.0,2019-08-12T14:06:32), (1442qbu9h3,28.0,2019-09-05T14:01:20)) 中的path语句。 尝试替换

foreach

带有下一个代码

<img src="<?php echo base_url(); echo $img['thumbnail_url']; ?>" alt="Los Angeles" style="width:30%;">

如果它不起作用，请在<img src="<?= base_url().$img['thumbnail_url']; ?>" alt="Los Angeles" style="width:30%;"> 之前加上print_r(base_url());并查看结果。如果您可以通过将结果与foreach配合使用来访问图像，那么您将在carusel项目中获得图像。 以相同的方式检查每个image path的有效性（$img['thumbnail_url']必须是图像网址数组）。