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lyear_components_progress.html

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        <header class="card-header"><div class="card-title">进度条</div></header>
        <div class="card-body">

          <p>这是关于 Bootstrap 的自定义进度条（progress bar）相关的文档和示例。进度条（progress bar）支持堆叠、动画背景和文本标签。</p>
          <h6>工作原理</h6>
          <p>进度条（progress）组件由两个 HTML 元素、一些用于设置宽度的 CSS 样式和一些其它属性组成。我们并未使用 <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Element/progress" target="_blank">HTML5 的 <code>&lt;progress&gt;</code> 元素</a>，以确保可以堆叠进度条（progress bar）并添加动画效果，以及在其上面放置文本标签。</p>
          <ul>
            <li>我们使用 <code>.progress</code> 作为最外层元素，用于指示进度条（progress bar）的最大值。</li>
            <li>我们在内部使用 <code>.progress-bar</code> 来指示到目前为止的进度。</li>
            <li><code>.progress-bar</code> 需要通过内联样式、工具类或自定义 CSS 属性来设置其宽度。</li>
            <li><code>.progress-bar</code> 还需要一些 <code>role</code> 和 <code>aria</code> 属性来实现其可访问性。</li>
          </ul>
          <p>将上面这些组合到一起，就是以下这些示例：</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>
          <p>Bootstrap 提供了几个用于设置宽度的工具类。根据你自己的需求，这些工具类可能有助于你快速设置进度。</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar w-75" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar w-75" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>
          <h6>标签</h6>
          <p>通过在 <code>.progress-bar</code> 元素内添加文本，就可以为进度条（progress bar）添加标签。</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">25%</div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"&gt;25%&lt;/div&gt;
&lt;/div&gt;</pre>
          <h6>高度</h6>
          <p>我们只为 <code>.progress</code> 设置了一个 <code>height</code> 值，因此，如果你改变了该值，内部的 <code>.progress-bar</code> 将自动地调整尺寸。</p>
          <div class="border-example">
            <div class="progress" style="height: 1px;">
              <div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress" style="height: 20px;">
              <div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
          </div>
          <pre>&lt;div class="progress" style="height: 1px;"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress" style="height: 20px;"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 25%;" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>
          <h6>背景色</h6>
          <p>通过使用背景色相关的工具类可以改变单个进度条（progress bar）的外观。</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>
          <h6>多个进度条</h6>
          <p>如果需要，可以在一个进度条（progress）组件内可以添加多个进度条（progress bar）。</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar" role="progressbar" style="width: 15%" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100"></div>
              <div class="progress-bar bg-success" role="progressbar" style="width: 30%" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100"></div>
              <div class="progress-bar bg-info" role="progressbar" style="width: 20%" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar" role="progressbar" style="width: 15%" aria-valuenow="15" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
  &lt;div class="progress-bar bg-success" role="progressbar" style="width: 30%" aria-valuenow="30" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
  &lt;div class="progress-bar bg-info" role="progressbar" style="width: 20%" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>
          <h6>条纹进度条</h6>
          <p>为任何 <code>.progress-bar</code> 添加 <code>.progress-bar-striped</code> 即可添加条纹样式，这是通过 CSS 的渐变功能在进度条（progress bar）的背景色上应用条纹效果实现的。</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar progress-bar-striped" role="progressbar" style="width: 10%" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar progress-bar-striped bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar progress-bar-striped bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar progress-bar-striped bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
            <div class="progress">
              <div class="progress-bar progress-bar-striped bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"></div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar progress-bar-striped" role="progressbar" style="width: 10%" aria-valuenow="10" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar progress-bar-striped bg-success" role="progressbar" style="width: 25%" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar progress-bar-striped bg-info" role="progressbar" style="width: 50%" aria-valuenow="50" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar progress-bar-striped bg-warning" role="progressbar" style="width: 75%" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;
&lt;div class="progress"&gt;
  &lt;div class="progress-bar progress-bar-striped bg-danger" role="progressbar" style="width: 100%" aria-valuenow="100" aria-valuemin="0" aria-valuemax="100"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>
          <h6>动画条纹</h6>
          <p>条纹渐变也可以有动画效果。为 <code>.progress-bar</code> 添加 <code>.progress-bar-animated</code> 即可利用 CSS3 动画功能添加条纹从右到左滚动的动画效果。</p>
          <div class="border-example">
            <div class="progress">
              <div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100" style="width: 75%"></div>
            </div>
          </div>
          <pre>&lt;div class="progress"&gt;
  &lt;div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="75" aria-valuemin="0" aria-valuemax="100" style="width: 75%"&gt;&lt;/div&gt;
&lt;/div&gt;</pre>

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