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进度条可以显示用户任务的完成过程。

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创建一个基本的进度条的步骤如下:
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar
"
 
style
=
"
width:70%
"
>
div
>
 
div
>
 尝试一下 » 
进度条高度默认为 16px。我们可以使用 CSS 的 height 属性来修改他:
<
div
 
class
=
"
progress
"
 
style
=
"
height:20px;
"
>
 
<
div
 
class
=
"
progress-bar
"
 
style
=
"
width:40%;
"
>
div
>
 
div
>
 尝试一下 » 
可以在进度条内添加文本,如进度的百分比:
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar
"
 
style
=
"
width:70%
"
>
70%
div
>
 
div
>
 尝试一下 » 
默认情况下进度条为蓝色,Bootstrap4 还提供了以下颜色的进度条:
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar bg-success
"
 
style
=
"
width:40%
"
>
div
>
 
div
>
 
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar bg-info
"
 
style
=
"
width:50%
"
>
div
>
 
div
>
 
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar bg-warning
"
 
style
=
"
width:60%
"
>
div
>
 
div
>
 
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar bg-danger
"
 
style
=
"
width:70%
"
>
div
>
 
div
>
 尝试一下 » 
可以使用 .progress-bar-striped 类来设置条纹进度条:
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar progress-bar-striped
"
 
style
=
"
width:40%
"
>
div
>
 
div
>
 尝试一下 » 
使用 .progress-bar-animated 类可以为进度条添加动画:
<
div
 
class
=
"
progress-bar progress-bar-striped progress-bar-animated
"
 
style
=
"
width: 40%
"
>
div
>
 尝试一下 » 
进度条可以设置多种颜色:
<
div
 
class
=
"
progress
"
>
 
<
div
 
class
=
"
progress-bar bg-success
"
 
style
=
"
width:40%
"
>
 Free Space 
div
>
 
<
div
 
class
=
"
progress-bar bg-warning
"
 
style
=
"
width:10%
"
>
 Warning 
div
>
 
<
div
 
class
=
"
progress-bar bg-danger
"
 
style
=
"
width:20%
"
>
 Danger 
div
>
 
div
>
 尝试一下 »