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Next, try another method, that is, use the following delegate function to complete the writing of this state machine. This is an example of object-oriented design. The former saves variables as attributes of objects, while the latter encloses variables in the environment formed by closures:这是什么精神？这就是穿越者的精神。本片讲述了由军人和地方人员共同研究国外飞来的飞行物，在研发过程中要面对各国的豺狼虎豹，然后组成了”利剑行动小组“在错综复杂的危险环境中，每名成员发挥各自智慧和特长，形成战无不胜的力量，在惊心动魄中，把国家赋予的使命向前推进。在进行了激烈的斗争后，我方拿到了飞行器的残壳。此后，展开殊死搏斗。讲述了一个戏精编辑与会读心术的霸总，俩人“不打不相识”，机缘巧合之下成为了室友，既有青梅竹马的相爱相杀，又有你在闹我在笑的霸道甜宠，而他们也在相处的日子里学会了如何体恤别人的辛苦和劳累，学会付出和怎么去爱一个人。每个人，在生命的历程中都一定会遭遇绝境，令灵魂坠入黑暗恐惧的深渊……In the scanning state, the file cannot be operated, neither can it be paused nor deleted, but can only wait for the scanning to complete. After the scan is completed, judging from the MD5 value of the file, if it is confirmed that the file already exists in the server, it directly jumps to the upload completion state. If the size of the file exceeds the maximum allowed upload, or the file is corrupted, the upload failure state is skipped. Only in the rest of the case will it enter the upload state. During the upload process, you can click the Pause button to pause the upload. After pause, clicking the same button will continue the upload. In the process of scanning and uploading, clicking the Delete button is invalid. Only after pausing, uploading is completed and uploading fails can the file be deleted.