Bootstrapbootstrap4这个页面前面已经加载了官方的bootstrap4的CDN的这四个文件
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/4.0.0-beta/css/bootstrap.min.css"> <script src="https://cdn.bootcss.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" ></script> <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.slim.min.js"></script> <script src="https://cdn.bootcss.com/popper.js/1.12.3/umd/popper.min.js"></script>
然后带入组件:可版本要是换成3.3.7的就正常了,不知道是哪里出现了问题(求bootstrap4的大神指点1,2)
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
<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>
<div class="carousel-inner" role="listbox">
<div class="carousel-item active">
<img class="d-block img-fluid" src="./images/1.jpg" alt="First slide">
</div>
<div class="carousel-item">
<img class="d-block img-fluid" src="./images/ribbon.png" alt="Second slide">
</div>
<div class="carousel-item">
<img class="d-block img-fluid" src="./images/2016.png" alt="Third slide">
</div>
</div>
<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>
