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Test if something is not undefined in JavaScript
...defined", instead of a useful message about an "un-caught exception @ line 123 of file xyz.js". Eventually a second developer will probably comment out the console.log() statement, making it more difficult for a 3rd developer to come in and fix a bug happening deep within doSomething().
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Linux 搭建NTP时间同步服务器 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...火墙需要关闭，否则会阻止NTP服务端口，NTP服务默认端口123)
6、通过ntpq –p静态查看NTP服务器与外部NTP服务器同步情况。
通过watch ntpq -p 动态查看NTP服务器与外部NTP服务器同步情况，一般需要等5--10分钟左右NTP服务器...
Python's most efficient way to choose longest string in list?
...the Python documentation itself, you can use max:
>>> mylist = ['123','123456','1234']
>>> print max(mylist, key=len)
123456
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Remove file extension from a file name string
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String.LastIndexOf would work.
string fileName= "abc.123.txt";
int fileExtPos = fileName.LastIndexOf(".");
if (fileExtPos >= 0 )
fileName= fileName.Substring(0, fileExtPos);
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App Inventor 2 列表的函数式编程 · App Inventor 2 中文网
... 隐私策略和使用条款 技术支持 service@fun123.cn
App Inventor 2 接入百度网盘API · App Inventor 2 中文网
... 隐私策略和使用条款 技术支持 service@fun123.cn
Delete multiple records using REST
...'ve allowed for a wholesale replacement of a collection, e.g. PUT ~/people/123/shoes where the body is the entire collection representation.
This works for small child collections of items where the client wants to review a the items and prune-out some and add some others in and then update the ser...
How to auto-generate a C# class file from a JSON string [closed]
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123
Visual Studio 2012 (with ASP.NET and Web Tools 2012.2 RC installed) supports this natively.
V...
Subdomain on different host [closed]
...records has to be setup on the dns for the domain e.g
mydomain.com has IP 123.456.789.999 and hosted with Godaddy. Now to get the sub domain
anothersite.mydomain.com
of which the site is actually on another server then
login to Godaddy and add an A record dnsimple anothersite.mydomain.com and po...
Microsecond timing in JavaScript
...returns the number of microseconds in the fractional (e.g. a value of 1000.123 is 1 second and 123 microseconds).
now() is monotonically increasing. This is important as Date.getTime() can possibly jump forward or even backward on subsequent calls. Notably, if the OS's system time is updated (e.g....