6 月 21 日消息 在电脑上刷抖音不用使用安卓模拟器了，有网友发现抖音网页版已经上线，抖音的官网页面进行了改版，已经可以看视频，并且支持登录、点赞、查看评论、分享视频。
抖音网页版整体比较简单，首页顶部提供了搜索功能，可以搜索视频和用户，此外还提供了全部、直播、娱乐、知识、二次元、游戏、美食、体育、时尚、音乐标签，下方就是一个个视频，几乎再没有其它元素。
在视频播放页面，功能还算比较丰富，支持暂停、拖拽进度条、倍速观看、悬浮小窗、音量调节、全屏观看，支持点赞视频和查看评论，但目前并不能发表评论，不知后续是否会添加该功能。
此外，登录支持验证码、扫码登录，不支持通过密码登录，登录后可以查看自己的作品、喜欢的视频。网页端还支持发布视频，视频文件大小不超过 4G，时长在 15 分钟以内，分辨率要求 720p（1280x720）及以上。
使用 exists 代替 in 是一个好的选择：
select num from a where num in(select num from b)
用下面的语句替换：
select num from a where exists(select 1 from b where num=a.num)
用法: exists后面一定是子查询语句，不能用（值1，值2）代替；where exists （查询），结构中没有列；exists后面的子查询不返回任何实际数据，只返回真或假，当返回真时 where条件成立，该条记录保留。
exists （查询），只要子查询不会空 则where条件就返回真。
News on June 17 According to the China Manned Space Engineering Office, the Shenzhou 12 manned spacecraft successfully completed its orbital status setting after it entered orbit. At 15:54 on June 17, 2021, Beijing time, it will adopt autonomous rapid rendezvous and docking. The model was successfully docked at the forward port of the Tianhe core cabin, forming a three-cabin (ship) combination with the previously docked Tianzhou-2 cargo spacecraft. The entire rendezvous and docking process lasted about 6.5 hours.
This is the first rendezvous and docking with a manned spacecraft after the Tianhe core module was launched into orbit. According to the mission implementation plan, three astronauts will then enter the Tianhe core module from the Shenzhou 12 manned spacecraft.
Ji Qiming, assistant director of the China Manned Space Engineering Office, introduced at the press conference that the Shenzhou 12 manned spacecraft flight crew is composed of astronauts Nie Haisheng, Liu Boming and Tang Hongbo. Nie Haisheng serves as commander and backup astronaut. They are Zhai Zhigang, Wang Yaping, and Ye Guangfu.
Among the three astronauts, super astronaut Nie Haisheng has participated in the Shenzhou 6 and Shenzhou 10 manned missions, super astronaut Liu Boming has participated in the Shenzhou 7 manned mission, and the second astronaut Tang Hongbo is the first flight.
The China Manned Space Engineering Office held a press conference at the Jiuquan Satellite Launch Center on the morning of the 16th. Ji Qiming, assistant to the director of the office, announced that after the research and decision of the space station stage flight mission command headquarters, it will aim at launching the Shenzhou 12 manned spacecraft at 9:22 on June 17th, Beijing time. The Long March 2 F remote launch mission will be carried out. Twelve Rockets carried out propellant refueling on the morning of the 16th.
Ji Qiming, assistant director of the China Manned Space Engineering Office, introduced at the press conference that the Shenzhou 12 manned spacecraft flight crew is composed of astronauts Nie Haisheng, Liu Boming and Tang Hongbo. Nie Haisheng serves as commander and backup astronaut. They are Zhai Zhigang, Wang Yaping, and Ye Guangfu.
Among the three astronauts, super astronaut Nie Haisheng has participated in the Shenzhou 6 and Shenzhou 10 manned missions, super astronaut Liu Boming has participated in the Shenzhou 7 manned mission, and the second astronaut Tang Hongbo is the first flight.
中国载人航天工程办公室主任助理季启明在新闻发布会上介绍说，神舟十二号载人飞船飞行乘组由航天员聂海胜、刘伯明和汤洪波三人组成，聂海胜担任指令长，备份航天员为翟志刚、王亚平、叶光富。
三名航天员中，特级航天员聂海胜参加过神舟六号、神舟十号载人飞行任务，特级航天员刘伯明参加过神舟七号载人飞行任务，二级航天员汤洪波是首次飞行。
办公室主任助理季启明宣布，经空间站阶段飞行任务总指挥部研究决定，将瞄准北京时间6月17日9时22分发射神舟十二号载人飞船，执行此次发射任务的长征二号F遥十二火箭16日上午进行推进剂加注。
小任班长的博客 