说明：  如何在进度条中显示数字进度,你应该是知道某一时刻的进度情况，不然，你也没有办法刷新进度条，所以，你只要将数字显示到进度条上就可以了。比如用个透明的标签之类
(how the progress of the figures showed progress, you should know the progress of a particular moment, otherwise, you have no way of the progress update, so, as long as you figure shows that the progress of on it. For example, using a transparent labels like)