The ignore_user_abort function sets whether a remote client can abort the running of a script.

函数的作用是：为远程客户端是否可以放弃执行一个脚本程序设置权限。

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Calling abort on a successfully completed request won't do anything and onreadystatechange is set to an empty function just in case the browser gets a delayed response for an old request.

在成功完成了的请求上调用abort不起任何作用，并且仅当浏览器收到一个对旧请求的延时响应的情况下，onreadystatechange才被设置为一个空函数。

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The "rec_check" function is used to abort the script with an error message if you attempt to re-block an already-blocked IP, or unblock an IP that isn't currently being blocked.

如果要重新阻止一个已被阻止的 IP，或者取消阻止当前未阻止的 IP，可以使用 "rec_check" 函数来放弃带错误消息的脚本。"

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