Two asynchronous download functions are provided, one is to directly download files, and the other is to slice and download files. The latter can prevent the problem of data array overflow when downloading large files

提供了两种异步下载函数，一种直接下载文件，一种对文件切片下载，后者能防止下载大文件时数据数组过大溢出的问题.

docu文档：https://drive.google.com/file/d/1X6OuZJn_zxse2uQeA1djZhCOlNtVMKE_/view?usp=sharing

bilibili: https://space.bilibili.com/3423025?spm_id_from=333.999.0.0

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