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How can I check if a background image is loaded?
...'<img/>').attr('src', 'http://farm6.static.flickr.com/5049/5220175127_5693faf952.jpg').load(function() { $('html').css('background-image', 'url(http://farm6.static.flickr.com/5049/5220175127_5693faf952.jpg)'); })) and check HTTP requests in Firebug. If I have opened flicker page with this imag...
Why is pow(a, d, n) so much faster than a**d % n?
... +1 that's actually what the docstring implies >>> print pow.__doc__ pow(x, y[, z]) -> number With two arguments, equivalent to x**y. With three arguments, equivalent to (x**y) % z, but may be more efficient (e.g. for longs).
– Hedde van der Heide
...
Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...777216
net.ipv4.tcp_wmem = 4096 4096 16777216
net.ipv4.tcp_mem = 786432 2097152 3145728
net.ipv4.tcp_max_syn_backlog = 16384
net.core.netdev_max_backlog = 20000
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycl...
How does facebook, gmail send the real time notification?
...
Alistair EvansAlistair Evans
32.3k66 gold badges3030 silver badges4848 bronze badges
...
How to get the size of a JavaScript object?
...fined/null.
– zupa
Jan 24 '13 at 16:32
3
"よんもじ".length is 4 in Javascript, but are you su...
Are there any reasons to use private properties in C#?
... them if I need to cache a value and want to lazy load it.
private string _password;
private string Password
{
get
{
if (_password == null)
{
_password = CallExpensiveOperation();
}
return _password;
}
}
...
Select first row in each GROUP BY group?
... SELECT p.id,
p.customer,
p.total,
ROW_NUMBER() OVER(PARTITION BY p.customer
ORDER BY p.total DESC) AS rk
FROM PURCHASES p)
SELECT s.*
FROM summary s
WHERE s.rk = 1
Supported by any database:
But you need to add logic...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
14.7. 数组
14.8. awk的内建函数
15. How-to
1. awk简介
awk是一种编程语言，用于在linux/unix下对文本和数据进行处理。数据可以来自标准输入、一个或多个文件，或其它命令的输出。它支持用户自定义函...
How does the “final” keyword in Java work? (I can still modify an object.)
In Java we use final keyword with variables to specify its values are not to be changed.
But I see that you can change the value in the constructor / methods of the class. Again, if the variable is static then it is a compilation error.
...
Handling specific errors in JavaScript (think exceptions)
...
try-catch-finally.js
Using try-catch-finally.js, you can call the _try function with an anonymous callback, which it will call, and you can chain .catch calls to catch specific errors, and a .finally call to execute either way.
Example
_try(function () {
throw 'My error';
})
.catch(Erro...