分析了文件上传系统的程序流程，对实现文件上传系统的关键技术进行了讨论。

The program flow of file uploading system is analyzed, and the crucial technologies of implementing the system are discussed.

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上次写的简便无刷新文件上传系统最初的目的就是用来实现这个图片预览效果。

Last write simple non-refresh file upload system is used to achieve the initial purpose of this image preview.

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如果上传无数大文件，操作系统会耗尽磁盘空间，导致整体故障。

If numerous large files are uploaded, the operating system could run out of disk space, resulting in a total failure.

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