我正在做这个演示。为什么我不能正确获取.carousel-item.active的当前索引号?
正如你所看到的，当第二张幻灯片显示时，我仍然得到第一张幻灯片的索引，等等
var totalItems = $('.carousel-item').length;
var currentIndex = $('.carousel-item.active').index() + 1;
var myCarousel = document.getElementById('carouselExampleIndicators')
myCarousel.addEventListener('slide.bs.carousel', function() {
currentIndex = $('.carousel-item.active').index() + 1;
$('#slide').text('' + currentIndex + ' / ' + totalItems + '');
});.carousel-item img {
max-height: 200px !important;
}
.carousel-indicators{
top:16px !important;
}<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<title>Hello, world!</title>
</head>
<body>
<div class="container">
<button type="button" class="btn btn-warning"><span id="slide">1 / 3</span></button>
<div id="carouselExampleIndicators" class="carousel slide" data-bs-ride="carousel">
<div class="carousel-indicators">
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1" aria-label="Slide 2"></button>
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2" aria-label="Slide 3"></button>
</div>
<div class="carousel-inner">
<div class="carousel-item active">
<img src="https://placeimg.com/300/280/tech" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="https://placeimg.com/300/280/people" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="https://placeimg.com/300/280/Place" class="d-block w-100" alt="...">
</div>
</div>
<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="visually-hidden">Previous</span>
</button>
<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="visually-hidden">Next</span>
</button>
</div>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.10.2/dist/umd/popper.min.js" integrity="sha384-7+zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG+2QOK9T+ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
</body>
</html>对于您的事件，尝试'slid.bs.carousel'而不是'slide.bs.carousel'。slide立即着火，slid在转换完成后着火
var totalItems = $('.carousel-item').length;
var currentIndex = $('.carousel-item.active').index() + 1;
var myCarousel = document.getElementById('carouselExampleIndicators')
myCarousel.addEventListener('slid.bs.carousel', function() {
currentIndex = $('.carousel-item.active').index() + 1;
$('#slide').text('' + currentIndex + ' / ' + totalItems + '');
});.carousel-item img {
max-height: 200px !important;
}
.carousel-indicators {
top: 16px !important;
}<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
<div class="container">
<button type="button" class="btn btn-warning"><span id="slide">1 / 3</span></button>
<div id="carouselExampleIndicators" class="carousel slide" data-bs-ride="carousel">
<div class="carousel-indicators">
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="0" class="active" aria-current="true" aria-label="Slide 1"></button>
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="1" aria-label="Slide 2"></button>
<button type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide-to="2" aria-label="Slide 3"></button>
</div>
<div class="carousel-inner">
<div class="carousel-item active">
<img src="https://placeimg.com/300/280/tech" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="https://placeimg.com/300/280/people" class="d-block w-100" alt="...">
</div>
<div class="carousel-item">
<img src="https://placeimg.com/300/280/Place" class="d-block w-100" alt="...">
</div>
</div>
<button class="carousel-control-prev" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="visually-hidden">Previous</span>
</button>
<button class="carousel-control-next" type="button" data-bs-target="#carouselExampleIndicators" data-bs-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="visually-hidden">Next</span>
</button>
</div>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.10.2/dist/umd/popper.min.js" integrity="sha384-7+zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG+2QOK9T+ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>