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就着youtube上的教程用html和js做了个小时钟. Code: clock.html //clock.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>JS Bin</title&g…
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With multi-frequency clocks being used in today’s devices, it's necessary to switch the source of a clock while the device is running. 1 Problem  The two clock frequencies can be totally unrelated to each other or they can be multiples of each other.…
先设置日期 date -s 20080103 再设置时间 date -s 18:24:30 为了永久生效,需要将修改的时间写入CMOS. 查看CMOS的时间: #clock -r 将当前系统时间写到CMOS中去 clock -w 艺搜参考 http://www.jb51.net/os/RedHat/1136.html…
选择调出页面的算法就称为页面置换算法.好的页面置换算法应有较低的页面更换频率,也就是说,应将以后不会再访问或者以后较长时间内不会再访问的页面先调出. 常见的置换算法有以下四种(以下来自操作系统课本). 1. 最佳置换算法(OPT) 最佳(Optimal, OPT)置换算法所选择的被淘汰页面将是以后永不使用的,或者是在最长时间内不再被访问的页面,这样可以保证获得最低的缺页率.但由于人们目前无法预知进程在内存下的若千页面中哪个是未来最长时间内不再被访问的,因而该算法无法实现. 最佳置换算法可以用来评…
创建 跟Clock相关的主要有Animation控件和Timeline控件,通常两者会放在一起使用. 在Cesium中,Viewer默认开启这两个控件,如果你想要不显示控件,可以在Viewer初始化中设置其为false,代码如下: 但这种方式只能在初始化时设置,无法动态的切换显示状态,灵活度上稍显不足.如果你有这方面的需要,可以使用如下这种方式,同时Widget是自适应,也会动态调整布局. 基于Viewer来创建这两个控件并不复杂,但某些时候(尽管我想不出这样的场景),用户希望在自己的div上创…
错误信息:C:\Python27\lib\site-packages\sklearn\utils\validation.py:395: DeprecationWarning: Passing 1d arrays as data is deprecated in 0.17 and will raise ValueError in 0.19. Reshape your data either using X.reshape(-1, 1) if your data has a single featu…
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