Boostrap 4 Carousel图片无法正确显示

编程问答 2022-06-09

问题描述

我有一个bootstrap 4传送带，并且在其中添加了3张图像。 我也希望它们作为全屏轮播，轮播的高度是设备的高度，并且可以正常工作。 但是问题出在图像的宽度上，该宽度似乎是响应性的，并停留在转盘包装内，但是图像无法正确显示。图像似乎被裁切，无法正确显示完整图像。 在正常模式下查看时，轮播正常工作，但在移动视图中查看时，轮播图片似乎被裁剪了。这是我的代码

 <html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
   <style>

.full-screen {
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

    </style>
</head>
<body>
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
                            <!-- Indicators -->
                            <ol class="carousel-indicators">
                              <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
                              <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
                              <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
                            </ol>
                            <!-- Wrapper for slides -->
                            <div class="carousel-inner">
                              <div class="carousel-item">
                                <img class="d-block w-100" src="images/banner-1.png"
                                 data-color="lightblue" alt="First Image">
                                <div class="carousel-caption d-md-block">
                                </div>
                              </div>
                              <div class="carousel-item">
                                <img class="d-block w-100" src="images/banner-2.png" data-color="firebrick" alt="Second Image">
                                <div class="carousel-caption d-md-block">
                                </div>
                              </div>
                              <div class="carousel-item">
                                <img class="d-block w-100" src="images/banner-3.png" data-color="violet" alt="Third Image">
                                <div class="carousel-caption d-md-block">
                                </div>
                              </div>
                            </div>
                            <!-- Controls -->
                            <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
                          <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                          <span class="sr-only">PrevIoUs</span>
                          </a>
                            <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
                          <span class="carousel-control-next-icon" aria-hidden="true"></span>
                          <span class="sr-only">Next</span>
                          </a>
                          </div>
</body>
</html>

<script>
var $item = $('.carousel-item'); 
var $wHeight = $(window).height();
$item.eq(0).addClass('active');
$item.height($wHeight); 

$item.addClass('full-screen');


$('.carousel img').each(function() {
  var $src = $(this).attr('src');
  var $color = $(this).attr('data-color');
  $(this).parent().css({
    'background-image' : 'url(' + $src + ')','background-color' : $color
  });
  $(this).remove();
});

$(window).on('resize',function (){
  $wHeight = $(window).height();
  $item.height($wHeight);
});

$('.carousel').carousel({
  interval: 1000,pause: "false"
});
    </script>
```

以下是一些示例输出快照： 普通视图

enter image description here

回应式检视

enter image description here

解决方法

您需要添加移动查询以将图片的背景尺寸设置为“包含”，而不是在小屏幕上“覆盖”。

<style>
@media only screen and (min-width: 768px) {
 .full-screen {
      background-size: contain;
      background-position: center;
      background-repeat: no-repeat;
  }
 }
</style>
,

在background-size: cover; CSS中删除.full-screen并将其切换为background-size: contain;似乎可以解决我的问题。显然，您可以将其删除，并且图像会变小/原始尺寸。

var $item = $('.carousel-item'); 
var $wHeight = $(window).height();
$item.eq(0).addClass('active');
$item.height($wHeight); 

$item.addClass('full-screen');


$('.carousel img').each(function() {
  var $src = $(this).attr('src');
  var $color = $(this).attr('data-color');
  $(this).parent().css({
    'background-image' : 'url(' + $src + ')','background-color' : $color
  });
  $(this).remove();
});

$(window).on('resize',function (){
  $wHeight = $(window).height();
  $item.height($wHeight);
});

$('.carousel').carousel({
  interval: 1000,pause: "false"
});
.full-screen {
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
}
<head>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>
<body>
  <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
    <!-- Indicators -->
    <ol class="carousel-indicators">
      <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
      <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
      <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
    </ol>
    <!-- Wrapper for slides -->
    <div class="carousel-inner">
      <div class="carousel-item">
        <img class="d-block w-100 img-fluid" src="https://www.drupal.org/files/drupal-wordmark.svg"
         data-color="lightblue" alt="First Image">
        <div class="carousel-caption d-md-block">
        </div>
      </div>
      <div class="carousel-item">
        <img class="d-block w-100 img-fluid" src="https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png" data-color="firebrick" alt="Second Image">
        <div class="carousel-caption d-md-block">
        </div>
      </div>
      <div class="carousel-item">
        <img class="d-block w-100 img-fluid" src="images/banner-3.png" data-color="violet" alt="Third Image">
        <div class="carousel-caption d-md-block">
        </div>
      </div>
    </div>
    <!-- Controls -->
    <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
    </a>
    <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
    </a>
  </div>

  <!-- jQuery library -->
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

  <!-- Popper JS -->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>

  <!-- Latest compiled JavaScript -->
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</body>

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