深入理解BootStrap -- 进度条（progressbar）14

Posted 2022-02-08 官小飞

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了深入理解BootStrap -- 进度条（progressbar）14相关的知识，希望对你有一定的参考价值。

1、进度条

在网页中，进度条的效果并不少见，比如一个评分系统，比如加载状态等。就如下图所示的一个评分系统，他就是一个简单的进度条效果：

进度条和其他独立组件一样，开发者可以根据自己的需要，选择对应的版本：

☑ LESS版本：源码文件progress-bars.less

☑ Sass版本：源码文件_progress-bars.scss

☑ 编译后版本：bootstrap.css文件第4500行～第4575行

而且Bootstrap框架为大家提供多种样式风格的进度条，供大家使用.

2、进度条–基本样式

Bootstrap框架中对于进度条提供了一个基本样式，一个100%宽度的背景色，然后个高亮的色表示完成进度。其实制作这样的进度条非常容易，一般是使用两个容器，外容器具有一定的宽度，并且设置一个背景颜色，他的子元素设置一个宽度，比如完成度是30%（也就是父容器的宽度比例值），同时给其设置一个高亮的背景色。

1、使用方法：

Bootstrap框架中也是按这样的方式实现的，他提供了两个容器，外容器使用“progress”样式，子容器使用“progress-bar”样式。其中progress用来设置进度条的容器样式，而progress-bar用于限制进度条的进度。使用方法非常的简单：

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress"</span>>
       <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:40%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

运行效果如下：

2、实现原理：

前面也说了，这样的基本进度条主要分成两部分：

progress样式主要设置进度条容器的背景色，容器高度、间距等：

/bootstrap.css文件第4516行～第4524行/

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">height</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">20</span>px</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">margin-bottom</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">20</span>px</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">overflow</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> hidden</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#f5f5f5</span></span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">border-radius</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">4</span>px</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">-webkit-box-shadow</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> inset <span class="hljs-number" style="box-sizing: border-box;">0</span> <span class="hljs-number" style="box-sizing: border-box;">1</span>px <span class="hljs-number" style="box-sizing: border-box;">2</span>px <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, .<span class="hljs-number" style="box-sizing: border-box;">1</span>)</span></span></span>;
          <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">box-shadow</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> inset <span class="hljs-number" style="box-sizing: border-box;">0</span> <span class="hljs-number" style="box-sizing: border-box;">1</span>px <span class="hljs-number" style="box-sizing: border-box;">2</span>px <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, .<span class="hljs-number" style="box-sizing: border-box;">1</span>)</span></span></span>;
<span class="hljs-rule" style="box-sizing: border-box;"></span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li></ul>

而progress-bar样式在设置进度方向，重要的是设置了进度条的背景颜色和过渡效果：

/bootstrap.css文件第4525行～第4538行/

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-bar</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">float</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> left</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">width</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">0</span></span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">height</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">100</span>%</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">font-size</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">12</span>px</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">line-height</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-number" style="box-sizing: border-box;">20</span>px</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#fff</span></span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">text-align</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> center</span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#428bca</span></span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">-webkit-box-shadow</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> inset <span class="hljs-number" style="box-sizing: border-box;">0</span> -<span class="hljs-number" style="box-sizing: border-box;">1</span>px <span class="hljs-number" style="box-sizing: border-box;">0</span> <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, .<span class="hljs-number" style="box-sizing: border-box;">15</span>)</span></span></span>;
          <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">box-shadow</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> inset <span class="hljs-number" style="box-sizing: border-box;">0</span> -<span class="hljs-number" style="box-sizing: border-box;">1</span>px <span class="hljs-number" style="box-sizing: border-box;">0</span> <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, <span class="hljs-number" style="box-sizing: border-box;">0</span>, .<span class="hljs-number" style="box-sizing: border-box;">15</span>)</span></span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">-webkit-transition</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> width .<span class="hljs-number" style="box-sizing: border-box;">6</span>s ease</span></span>;
          <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">transition</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> width .<span class="hljs-number" style="box-sizing: border-box;">6</span>s ease</span></span>;
<span class="hljs-rule" style="box-sizing: border-box;"></span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>

3、结构优化：

虽然这样实现了基本进度条效果，但对于残障人员浏览网页有点困难，所以我们可以将结构做得更好些（语义化更友好些）：

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:40%;"</span> role=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progressbar"</span> aria-valuenow=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"40"</span> aria-valuemin=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"0"</span> aria-valuemax=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"100"</span>>
        <span <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"sr-only"</span>><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">40</span>% Complete</span>
    </<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

1、role属性作用：告诉搜索引擎这个div的作用是进度条。
2、aria-valuenow="40"属性作用：当前进度条的进度为40%。
3、aria-valuemin="0"属性作用：进度条的最小值为0%。
4、aria-valuemax="100"属性作用：进度条的最大值为100%。

3、进度条–彩色进度条

Bootstrap框架中的进度条和警告信息框一样，为了能给用户一个更好的体验，也根据不同的状态配置了不同的进度条颜色。在此称为彩色进度条，其主要包括以下四种：

☑ progress-bar-info：表示信息进度条，进度条颜色为蓝色

☑ progress-bar-success：表示成功进度条，进度条颜色为绿色

☑ progress-bar-warning：表示警告进度条，进度条颜色为黄色

☑ progress-bar-danger：表示错误进度条，进度条颜色为红色

1、使用方法：

具体使用就非常简单了，只需要在基础的进度上增加对应的类名。如：

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-success"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:40%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-info"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:60%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-warning"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:80%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-danger"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:50%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>

运行效果如下：

2、实现原理：

彩色进度条与基本进度条相比，就是进度条颜色做了一定的变化，其对应的样式代码如下：

/bootstrap.css文件第4548行～第4550行/

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-bar-success</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#5cb85c</span></span></span>;
<span class="hljs-rule" style="box-sizing: border-box;"></span></span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*bootstrap.css文件第4555行～第4557行*/</span>
<span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-bar-info</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#5bc0de</span></span></span>;
<span class="hljs-rule" style="box-sizing: border-box;"></span></span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*bootstrap.css文件第4562行～第4564行*/</span>
<span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-bar-warning</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#f0ad4e</span></span></span>;
<span class="hljs-rule" style="box-sizing: border-box;"></span></span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">/*bootstrap.css文件第4569行～第4571行*/</span>
<span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-bar-danger</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-color</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-hexcolor" style="box-sizing: border-box;">#d9534f</span></span></span>;
<span class="hljs-rule" style="box-sizing: border-box;"></span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li></ul>

4、进度条–条纹进度条

在Bootstrap框架中除了提供了彩色进度条之外，还提供了一种条纹进度条，这种条纹进度条采用CSS3的线性渐变来实现，并未借助任何图片。使用Bootstrap框架中的条纹进度条只需要在进度条的容器“progress”基础上增加类名“progress-striped”，当然，如果你要让你的进度条条纹像彩色进度一样，具有彩色效果，你只需要在进度条上增加相应的颜色类名，如前面的彩色进度条所讲。

一起来看一下制作条纹进度条的结构：

<code class="hljs applescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress progress-striped"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-success"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:40%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress progress-striped"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-info"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:60%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress progress-striped"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-warning"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:80%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
<<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress progress-striped"</span>>
    <<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span> <span class="hljs-type" style="box-sizing: border-box;">class</span>=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"progress-bar progress-bar-danger"</span> style=<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"width:50%"</span>></<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>>
</<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">div</span>></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li></ul>

运行效果如下：

1、原现实现：

正如前面所说，实现条纹进度条，主要使用的是CSS3的线性渐变，其具体代码如下：

/bootstrap.css文件第4539行～第4547行/

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-striped</span> <span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.progress-bar</span> <span class="hljs-rules" style="box-sizing: border-box;">
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-image</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"> <span class="hljs-function" style="box-sizing: border-box;">-webkit-linear-gradient(<span class="hljs-number" style="box-sizing: border-box;">45</span>deg, <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255</span>, .<span class="hljs-number" style="box-sizing: border-box;">15</span>)</span> <span class="hljs-number" style="box-sizing: border-box;">25</span>%, transparent <span class="hljs-number" style="box-sizing: border-box;">25</span>%, transparent <span class="hljs-number" style="box-sizing: border-box;">50</span>%, <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255</span>, .<span class="hljs-number" style="box-sizing: border-box;">15</span>)</span> <span class="hljs-number" style="box-sizing: border-box;">50</span>%, <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255</span>, .<span class="hljs-number" style="box-sizing: border-box;">15</span>)</span> <span class="hljs-number" style="box-sizing: border-box;">75</span>%, transparent <span class="hljs-number" style="box-sizing: border-box;">75</span>%, transparent)</span></span></span>;
  <span class="hljs-rule" style="box-sizing: border-box;"><span class="hljs-attribute" style="box-sizing: border-box;">background-image</span>:<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 102, 102);"><span class="hljs-function" style="box-sizing: border-box;">linear-gradient(<span class="hljs-number" style="box-sizing: border-box;">45</span>deg, <span class="hljs-function" style="box-sizing: border-box;">rgba(<span class="hljs-number" style="box-sizing: border-box;">255</span>, <span class="hljs-number" style="box-sizing: border-box;">255<以上是关于深入理解BootStrap -- 进度条（progressbar）14的主要内容，如果未能解决你的问题，请参考以下文章 
 Bootstrap进度条
 《2019面向对象程序设计（java）课程学习进度条》
 ，进度条
 bootstrap与jQuery结合的动态进度条
 Bootstrap 进度条不会在 Angular HTTP 事件进度中自动更新
 Bootstrap-进度条