Bootstrap4 轮播

轮播是一个循环的幻灯片，创建了一个简单的图片轮播效果：

注意：使用Bootstrap4时，<script> 标签放到页面底部的 </body> 标签之前。注意顺序，jQuery 必须放在最前面，然后是 Popper.js，最后是我们自己的 JavaScript 插件。

<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.1.0/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/popper.js/1.12.5/umd/popper.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
  <style>
     img {
      width: 100%;
      height: 100%;
  }
  </style>
</head>
<body>

<div id="demo" class="carousel slide" data-ride="carousel">
 
  <!-- 指示符 -->
  <ul class="carousel-indicators">
    <li data-target="#demo" data-slide-to="0" class="active"></li>
    <li data-target="#demo" data-slide-to="1"></li>
    <li data-target="#demo" data-slide-to="2"></li>
  </ul>
 
  <!-- 轮播图片 -->
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="http://static.runoob.com/images/mix/img_fjords_wide.jpg">
    </div>
    <div class="carousel-item">
      <img src="http://static.runoob.com/images/mix/img_nature_wide.jpg">
    </div>
    <div class="carousel-item">
      <img src="http://static.runoob.com/images/mix/img_mountains_wide.jpg">
    </div>
  </div>
 
  <!-- 左右切换按钮 -->
  <a class="carousel-control-prev" href="#demo" data-slide="prev">
    <span class="carousel-control-prev-icon"></span>
  </a>
  <a class="carousel-control-next" href="#demo" data-slide="next">
    <span class="carousel-control-next-icon"></span>
  </a>
 
</div>

创建响应式轮播

html代码：

<div id="demo" class="carousel slide" data-ride="carousel">
        <!-- 指示符 -->
        <ul class="carousel-indicators">
            <li data-target="#demo" data-slide-to="0" class="active"></li>
            <li data-target="#demo" data-slide-to="1"></li>
            <li data-target="#demo" data-slide-to="2"></li>
            <li data-target="#demo" data-slide-to="3"></li>
        </ul>

        <!-- 轮播图片 -->
        <div class="carousel-inner">
            <div class="carousel-item active carousel-bg1">
                <img src="./img/slide_01_640x340.jpg" style="width: 100%;">
            </div>
            <div class="carousel-item carousel-bg2">
                <img src="./img/slide_02_640x340.jpg" style="width: 100%;">
            </div>
            <div class="carousel-item carousel-bg3">
                <img src="./img/slide_03_640x340.jpg" style="width: 100%;">
            </div>
            <div class="carousel-item carousel-bg4">
                <img src="./img/slide_04_640x340.jpg" style="width: 100%;">
            </div>
        </div>
        <!-- 左右切换按钮 -->
        <a class="carousel-control-prev" href="#demo" data-slide="prev">
            <span class="carousel-control-prev-icon"></span>
        </a>
        <a class="carousel-control-next" href="#demo" data-slide="next">
            <span class="carousel-control-next-icon"></span>
        </a>
    </div>
    <!-- 轮播图结束 -->

css代码：

/* 轮播图 */
@media screen and (max-width: 640px) {
    #demo div.carousel-item img {
        display: block;
    } 
}
@media screen and (min-width:640px) {
    #demo div.carousel-item img {
        display:none;
    }
    #demo div.carousel-bg1 {
        height: 410px;
        width: 100%;
        background: url("../img/slide_01_2000x410.jpg") no-repeat center center;
    }
    #demo .carousel-bg2 {
        height: 410px;
        width: 100%;
        background: url("../img/slide_02_2000x410.jpg") no-repeat center center;
    }
    #demo .carousel-bg3 {
        height: 410px;
        width: 100%;
        background: url("../img/slide_03_2000x410.jpg") no-repeat center center;
    } 
    #demo .carousel-bg4 {
        height: 410px;
        width: 100%;
        background: url("../img/slide_04_2000x410.jpg") no-repeat center center;
    } 
}

注意：将大图设置为背景图可以使用居中对齐使图片看上去更整洁明了，利用媒体属性可以时网站适应屏幕显示大小，将小图设置为img标签里，只要使用display：none；便可以使其隐藏。

使用Bootstrap4中轮播效果做响应式轮播图

Bootstrap4 轮播

创建响应式轮播

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