首先查看robots.txt，文档说明是允许爬虫的
使用正则表达式稍做处理，得到一个json文件，
查找接口：第一次对整个页面进行了爬取，发现返回的内容并不包含我们所需要的信息。说明这部分的信息是通过AJAX渲染的，这就需要我们去查找接口。按F12打开开发者模式，寻找数据相对应的API接口。如下：
查看请求头：
发现是GET请求，使用python之中的requests库对该接口模拟发送GET请求。
将json文件转换为dataframe，之后转换为excel文件导出。
返回的内容之中包含一个json格式的文件:
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