bootstrap (3.3.7) youtube风格的图像轮播

<div id="carousel-example" class="carousel slide" data-ride="carousel">
  <!-- 指示器 -->
  <ol class="carousel-indicators">
    <li data-target="#carousel-example" data-slide-to="0" class="active"></li>
    <li data-target="#carousel-example" data-slide-to="1"></li>
    <li data-target="#carousel-example" data-slide-to="2"></li>
  </ol>

  <!-- 图像轮播 -->
  <div class="carousel-inner">
    <div class="item active">
      <img src="image1.jpg" alt="Image 1">
      <div class="carousel-caption">
        <h3>标题 1</h3>
        <p>描述 1</p>
      </div>
    </div>
    <div class="item">
      <img src="image2.jpg" alt="Image 2">
      <div class="carousel-caption">
        <h3>标题 2</h3>
        <p>描述 2</p>
      </div>
    </div>
    <div class="item">
      <img src="image3.jpg" alt="Image 3">
      <div class="carousel-caption">
        <h3>标题 3</h3>
        <p>描述 3</p>
      </div>
    </div>
  </div>

  <!-- 左右切换按钮 -->
  <a class="left carousel-control" href="#carousel-example" data-slide="prev">
    <span class="glyphicon glyphicon-chevron-left"></span>
  </a>
  <a class="right carousel-control" href="#carousel-example" data-slide="next">
    <span class="glyphicon glyphicon-chevron-right"></span>
  </a>
</div>