...In modern browsers, it can give full play to the advantages of HTML5, without abandoning the mainstream IE browser, using the original FLASH runtime, compatible with IE6+, iOS 6+, and android 4+. When the two sets are running, the same calling method is available for users to choose at will. Using large files to upload concurrently in fragments greatly improves the efficiency of file uploads. Fragmentation and concurrency are combined to divide a large file into multiple pieces and upload them concurrently, which greatly improves the upload speed of large files. When network problems cause transmission errors, only the error fragments need to be retransmitted instead of the entire file. ...