bilibili排行榜爬取

 众所周知，B站学习软件。哈哈哈哈，今天我们就爬取B站的排行榜。废话不多说了，直接开始了。

分析：

 我们看图一可以发现每个是视频的info都在li的标签里，我可以用xpath得到，在这里我想获得视频的封面，播放量，综合得分以及视频链接；除了封面，其它的都可以得到，后来我在另一个另一个链接中发现了，我在后面会讲到。

图一：

我们点开视频链接，进入视频播放页，F12一下，点击network，让视频播放，会发现有许多xhr文件不断刷新（如图二文件），它以m4s结尾

                                         图二：

我们可推断视频是每段小段m4s的文件结合起来。我复制其中一个链接，打开后，如图三

                                     图三：

这时我们该想另一件事，即使我们能获得这个文件，我们该怎么获取这样一个个链接，我找了好大一会，找不到，那我们就应该换一种思路，是不是有一个完整的视频链接，它会保存到什么地方，最后被我找到了，它其实隐藏在一开始的elements中，这是我们在里面搜索一下window,会发现图四：

                                         图四：

这时我们可以打开页面源码，把进行查看,我第一眼感觉他是json文件，这里我们可以用正则获取，我们分析一下：

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