A ProgressBar is like an output-only Slider in that it can be used to show incremental activity (progress).
ProgressBar 类似于一个只输出的 Slider，因为可以用它来展示增量活动（进度）。
For example, if we set the slider to 6 it will only show data from day 6 onward. The code for this is shown in Listing 3.
比如，如果我们设置滑块到6，它就会只显示从第六天开始的数据。
Move through the visualization in time by dragging the slider, or press the play button to show an animation.
通过拖动滑块按时间浏览可视化地图，或者按下播放按钮显示动画。
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