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app inventor 2 怎么进行延迟操作? - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!

...?https://www.fun123.cn/reference/creative/sim_sleep.html App Inventor 2 模拟sleep函数 App Inventor 2 原生没有 sleep 及相关函数,需要模拟实现,经过测试这里给出一个既简单又相对高效率的实现方案:需要用到计时器组件: 实现代码如下: 代码...
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/data/user/0/xxxx/files(内部存储)和 /storage/emulated/0/Android/data...

...私有目录/storage/emulated/0/Android/data/xxxx/files外部存储(如模拟的 SD 卡) 内部存储:始终位于系统分区,与应用绑定,用户无法直接通过文件管理器访问(需 Root)。外部存储:位于用户可见的存储空间(如 /sdcard/),路径可能因...
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How can I develop for iPhone using a Windows development machine?

... using a pre-modified) image of Leopard that can be installed on a regular PC. This is not as hard as you would think, although your success/effort ratio will depend upon how closely the hardware in your PC matches that in Mac hardware - e.g. if you're running a Core 2 Duo on an Intel Motherboard, w...
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VR硬件行业洗牌进行时 70%创业公司倒闭转行做内容 - 资讯 - 清泛网 - 专注C...

...用手机加VR眼镜,便携且轻,比如三星的GEARVR;第二档是PC端,也就是头戴式显示器,比如HTCVive;第三档是一体机,对设备的计算能力要求高,比如售价昂贵的微软“黑科技”Hololens。 在记者走访的公司中,内容创业普遍的着眼...
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Pandas - How to flatten a hierarchical index in columns

...F', 'WBAN', 'day', 'month', 's_CD sum', 's_CL sum', 's_CNT sum', 's_PC sum', 'tempf amax', 'tempf amin', 'year'] share | improve this answer | follow ...
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Redis消息通知系统的实现 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术

...现了优先级。 不过ZSET没有原生的POP操作,所以我们需要模拟实现,代码如下: <?php class RedisClient extends Redis { const POSITION_FIRST = 0; const POSITION_LAST = -1; public function zPop($zset) { return $this->zsetPop($zset, self:...
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How do I drop a foreign key constraint only if it exists in sql server?

... inline table-valued function IT = Internal table P = SQL Stored Procedure PC = Assembly (CLR) stored-procedure PG = Plan guide PK = PRIMARY KEY constraint R = Rule (old-style, stand-alone) RF = Replication-filter-procedure S = System base table SN = Synonym SO = Sequence object Applies to: SQL S...
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Unicode equivalents for \w and \b in Java regular expressions?

...h a J-results column for Java and a P-results column for Perl or any other PCRE-based regex engine: Regex 001A 0085 00A0 2029 J P J P J P J P \s 1 1 0 1 0 1 0 1 \pZ 0 0 0 0 1 1 ...
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VSS使用指南 - 开源 & Github - 清泛网 - 专注IT技能提升

VSS使用指南VSS 指南概述VSS是一个本控制工具。其操作比较简单,使用方便,又能达到公司的需求,所以VSS在我们公司得到了很好的应用。VSS具体的操作方法请参...概述 VSS是一个本控制工具。其操作比较简单,使用方便,又...
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Practical usage of setjmp and longjmp in C

... /* default SIGBUS handler */ } Context; extern Context * pC; extern Class Throwable; #define except_class_declare(child, parent) extern Class child #define except_class_define(child, parent) Class child = { 1, parent, #child } except_class_declare(Exception, ...