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https://bbs.tsingfun.com/thread-1849-1-1.html 

App Inventor 2 怎么做倒计时,时倒计时,分倒计时,秒倒计时怎么做? - A...

App Inventor 2 倒计时,分倒计时,秒倒计时怎么做?例输入10分钟,或输入1小时,启动后开始显示倒计时?,客位大老能做个实例吗,谢谢?https://www.fun123.cn/reference/components/guide/Clock.html 知识点都在这里,代码需要你自己写!(...
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移动前端开发之viewport的深入理解 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...,分辨率也是五花八门,安卓设备上的一个css像素相当于多少个屏幕物理像素,也因设备的不同而不同,没有一个定论。 还有一个因素也会引起css中px的变化,那就是用户缩放。例如,当用户把页面放大一倍,那么css中1px所...
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Unnecessary curly braces in C++?

... my_variable out of its intended scope by accident. Example 2: namespace N1 { class A { }; } namespace N2 { class A { }; } void foo() { { using namespace N1; A a; // N1::A. // ... } { using namespace N2; A a; // N2::A. // ... } } ...
https://bbs.tsingfun.com/thread-585-1-1.html 

Sql server默认的端口是多少?如何开启远程连接? - 爬虫/数据库 - 清泛IT...

默认是1433,可以在配置管理器中查看: 需要开放1433端口,可以参考《Windows、Linux开放指定端口》。 另外,开启远程连接还需要启用TCP/IP,然后重启服务,步骤如下:
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手机测高仪 · App Inventor 2 中文网

...倾斜角可能是正数也可能是负数。 我们只关心”抬起了多少度”,不关心正负,取绝对值最省事。 先把这几行写好,连上 AI伴侣,然后: 手机平放在桌上,看看显示多少度?(应该接近 0) 手机竖起来,屏幕正对...
https://www.tsingfun.com/down/ebook/49.html 

莱昂氏unix源代码分析 PDF - 文档下载 - 清泛网 - 专注C/C++及内核技术

莱昂氏unix源代码分析 PDF莱昂 源代码本书由上、下两篇组成。上篇为UNIX版本6的源代码,下篇是莱昂先生对UNIX操作系统版本6源代码的详细分析。本书语言简洁、透彻,曾作为未公开...本书由上、下两篇组成。上篇为UNIX版本6的源...
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How can I get the diff between all the commits that occurred between two dates with Git?

...og --pretty="format:%H" --since="1 day ago");git diff $(echo "$revs"|tail -n1) $(echo "$revs"|head -n1) works somehow, but seems complicated and does not restrict to the current branch. Finally: git diff $(git rev-list -n1 --before="1 day ago" master) seems to work and a default way to do simil...
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O(nlogn) Algorithm - Find three evenly spaced ones within binary string

...uld be of the order of the square of the number of 1s in it: that's 4k ≈ n1.26 which unfortunately is asymptotically much larger than (n log n). In fact, the worst case is even worse: Leo Moser in 1953 constructed (effectively) such strings which have n1-c/√(log n) 1s in them but no evenly space...
https://www.tsingfun.com/it/tech/717.html 

由12306.cn谈谈网站性能技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...讨论那些UI,用户体验,或是是否把支付和购票下单环节分开的功能性的东西) 业务 任何技术都离不开业务需求,所以,要说明性能问题,首先还是想先说说业务问题。 其一,有人可能把这个东西和QQ或是网游相比。但我觉...