web 大文件的处理
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https://github.com/statsim/preview 纯前端的大文件预览
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https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#range
Actually, PDF.js is doing just that. PDF is a complicated format; in most of the cases, the vital data of a PDF document is located at the end. Depending on browser support and on what web server returns the HTTP Range Requests headers, PDF.js may automatically start using HTTP Range Requests to fetch not-yet-loaded portions of a PDF needed for rendering visible pages, so a document can be rendered without fully loading it. -
https://github.com/mholt/PapaParse
Fast and powerful CSV (delimited text) parser that gracefully handles large files and malformed input
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