Javascript：只读取大型服务器文本文件的最后x行数 [英] Javascript: Reading only the last x amount of lines of large server text file

问题描述

今天我正在使用非常大的日志文件，我希望通过我的RPi上的lighttpd显示它们，但它们每天都会变大，因此很快就需要很长时间才能加载。

today I was working with very large log files and I want to display them via lighttpd on my RPi, but they grow bigger every day and thus soon will take a very long time to load.

为了防止这个问题，我想我可以有一个按钮来读取，比如说这个日志文件的最后500行。当然我对javascript的经验不多，但我认为它是可行的，对吧？

To prevent this problem I figured I would be able to have a button to read, say the last 500 lines from this log file. Of course I have not much experience with javascript, but I think it is doable, right?

无论如何，我找不到任何好的教程来描述如何在javascript，虽然我在PHP中找到了这个 ，但由于我不使用PHP，我无法使用它。因此，一个如何读取javascript中的最后500行的示例，或者每次单击从文件末尾开始的按钮逐步读取500行的按钮对我来说都是非常少的。

Anyway, I couldn't find any good tutorial describing how to do this in javascript, although I found this in PHP, but since I'm not working in PHP I cannot use it. So, a example of how to read the last 500 lines in javascript or maybe a button to progressively read 500 lines every time you click on a button starting from the end of the file would be extremely handful for me.

提前谢谢你们。

（ PS ：我读过它是不可能阅读的使用javascript文件，但是使用AJAX调用是可能的。）

(P.S: I've read it's not possible to read a file with javascript, but with AJAX calls it is possible.)

推荐答案

不，使用JavaScript是不可能的。客户端在统一资源定位器上请求资源 - 如果这是所需的响应，则由服务器来提供最后500行。

No, it's not possible with JavaScript. The client makes a request for a resource at a uniform resource locator - it's up to your server to serve up the last 500 lines if that's the desired response.

简单的unix命令如果没有PHP， tail -500 mylog 可以被许多服务器端脚本语言解释。

Simple unix command tail -500 mylog can be interpreted by a number of server-side scripting languages if PHP isn't available to you.

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