可以断点续传下载，同时多个任务下载，保留了迅雷接口下载（程序没用，因为用迅雷的接口，老是弹迅雷的广告）-Can download, breakpoint continuingly download multiple tasks at the same time, keep the thunderbolt download interface (program doesn t work, because use the interface of thunderbolt, always play t