多线程多任务下载文件1.1无支持库，带调用列子 易语言源码-Multi-threaded multi-task to download files 1.1 No support libraries with calls Liezi easy language source code

多线程下载文件，可多个任务同时执行下载，并回调每个任务的下载进度，和下载速度，以及总速度(Multi thread download files, multiple tasks can be d at the same time to download, and callback the progress of each task download, and download speed, as well as the total speed)