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How to check 'undefined' value in jQuery
...
JQuery library was developed specifically to simplify and to unify certain JavaScript functionality.
However if you need to check a variable against undefined value, there is no need to invent any special method, since JavaScript has a typeof operator, which is...
How to install a gem or update RubyGems if it fails with a permissions error
I'm trying to install a gem using gem install mygem or update RubyGems using gem update --system , and it fails with this error:
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Python's json module, converts int dictionary keys to strings
...which implement a __hash__ method. (The Lua docs suggest that it automatically uses the object's ID as a hash/key even for mutable objects and relies on string interning to ensure that equivalent strings map to the same objects).
In Perl, Javascript, awk and many other languages the keys for hash...
Best practices for catching and re-throwing .NET exceptions
... that bombs here
} catch (Exception ex)
{
throw;
}
throw ex; is basically like throwing an exception from that point, so the stack trace would only go to where you are issuing the throw ex; statement.
Mike is also correct, assuming the exception allows you to pass an exception (which is recom...
Group a list of objects by an attribute : Java
... list);
} else {
hashMap.get(locationId).add(student);
}
If you want all the student with particular location details then you can use this:
hashMap.get(locationId);
which will get you all the students with the same the location ID.
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What resources exist for Database performance-tuning? [closed]
...tabase, this guide may also help.
http://download.oracle.com/docs/cd/B28359_01/server.111/b28274/toc.htm
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CDHtmlDialog的基本使用（C++调用JS函数的实现） - C/C++ - 清泛网 - 专注IT技能提升
CDHtmlDialog的基本使用（C++调用JS函数的实现）CDHtmlDialog_cpp_call_js_interactiveCDHtmlDialog C++ JS《CDHtmlDialog的基本使用（JS调用C++函数的实现）》本文基于以上文章，在其代码基础上拓展：一、在主对话框上添加一个C++按钮，步骤如下：....
C++虚析构函数解析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...类的状况发生。
以下内容转自： http://blog.sina.com.cn/s/blog_7c773cc50100y9hz.html
a.第一段代码
#include<iostream>
using namespace std;
class ClxBase{
public:
ClxBase() {};
~ClxBase() {cout << "Output from the destructor of class ClxBase!" << endl;};
void ...
TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...产数据2亿多条导入测试
先建集合，创建3个索引，包括_id共4个索引。
TokuMX 5个多小时导完数据，官方MongoDB 2.2.4版本竟然花了2天2夜多，近58个小时
使用mongostat统计，每分钟取值一个，纵坐标为inserts/s,横坐标为分钟。
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修改centos字符集导致桌面进不去的一系列问题 - 更多技术 - 清泛网 - 专注C...
...件夹删掉就可以了
参考资料
http://blog.sina.com.cn/s/blog_54cae6d70101gwev.html
http://www.bianbian.me/2013/05/how-to-get-desktop-directory-path-in-chinese-linux.html
写在后面
改变字符集后，原系统中很多中文文件都是乱码，需要手动转码很不方便...