关于网站被篡改的问题？

Question

网站服务器的FTP服务被黑客攻击了。得到权限后，将所有服务器内的js文件添加了以下代码，请问这是一段什么相关的代码？
我打开被感染的页面后，只提示各种js错误。他们的目的是什么？

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