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Why are my basic Heroku apps taking two seconds to load?
...ut Tom Robinson's answer to "Scalability: How Does Heroku Work?" on Quora: http://www.quora.com/Scalability/How-does-Heroku-work
Heroku divides up server resources among many different customers/applications. Your app is allotted blocks of computing power. Heroku partitions based on resource demand...
Play an audio file using jQuery when a button is clicked
... = document.createElement('audio');
audioElement.setAttribute('src', 'http://www.soundjay.com/misc/sounds/bell-ringing-01.mp3');
audioElement.addEventListener('ended', function() {
this.play();
}, false);
audioElement.addEventListener("canplay",function(){
...
Comparing Timer with DispatcherTimer
...
I've found good article about timers with small examples here:
http://www.progware.org/Blog/post/Timers-in-WPF.aspx
As a conclusion:
If DoSomething() manipulates GUI components then with the Timer you need to use: this.Dispatcher.Invoke((Action)delegate { //GUI RELATED CODE HERE} since ...
C++ 使用OLE/COM高速读写EXCEL的源码 - c++1y / stl - 清泛IT社区，为创新赋能！
本源码主要通过OLE/COM实现对Excel表格的操作。
另外，代码中汇聚各网友的智慧进行了优化（比如预加载等），可以加快OLE读取的EXCEL的速度。
原文详见：http://www.tsingfun.com/html/2016/dev_0530/1454.html
下载地址：
How do I get SUM function in MySQL to return '0' if no values are found?
...FROM table
WHERE ...
To see it in action, please see this sql fiddle: http://www.sqlfiddle.com/#!2/d1542/3/0
More Information:
Given three tables (one with all numbers, one with all nulls, and one with a mixture):
SQL Fiddle
MySQL 5.5.32 Schema Setup:
CREATE TABLE foo
(
id INT NOT N...
Large Numbers in Java
...
Use the BigInteger class that is a part of the Java library.
http://java.sun.com/j2se/1.5.0/docs/api/java/math/BigInteger.html
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Node.js vs .Net performance
...you start making I/O requests that block the thread (call to a DB, make an http request to a service, read a file from disk). These blocking requests mean that your valuable thread from the thread pool is doing nothing. The more blocking you have, the less LOAD your ASP.NET app is going to be able t...
Backwards migration with Django South
...0001_initial
"zero" is a special state before any migration.
Reference: http://south.aeracode.org/docs/commands.html
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How to simulate a mouse click using JavaScript?
...rties you want to give it */
});
targetElement.dispatchEvent(evt);
Demo: http://jsfiddle.net/DerekL/932wyok6/
This works on all modern browsers. For old browsers including IE, MouseEvent.initMouseEvent will have to be used unfortunately though it's deprecated.
var evt = document.createEvent("Mo...
How do I convert a hexadecimal color to rgba with the Less compiler?
...fade(@baseColor, 100%)
/* color:#d14836; */
}
Test this code online: http://lesstester.com/
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