网站如下，它是一个发布毒品信息的中文网站。
共有769项。而且我希望所有数据都在一个Excel中。
请注意，您可以输入开始和结束时间以查找所有药物的列表，但是必须单击药物名称才能进入另一个网站以获取足够的信息。
# the required field names are as follows:
a = c("批准文号/注册证号","药品名称剂型","规格","参比制剂","标准制剂","批准日期","上市许可持有人","生产厂商","上市销售状况","收录类别")
# the first names can be found from the first page of the website:
a1 = c("批准文号/注册证号","药品名称剂型","规格","参比制剂","标准制剂","批准日期","上市许可持有人")
# the last 3 names can only be found after you click drug names.
a2 = c("生产厂商","上市销售状况","收录类别")