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编程基础与事件状态 01：让按钮响应你的任务 · App Inventor 2 中文网
...有工程时，同名事件合并处理。
when 按钮_开始.Click() {
if trim(文本输入框_任务.Text) = "" { 标签_状态.Text = "请填写任务" }
else { 标签_状态.Text = join("开始：", trim(文本输入框_任务.Text)) }
}
中途检查与排错
本课以...
How to replace plain URLs with links?
...s, and there are a few worth using despite some downsides:
Soapbox's linkify has seen some serious effort put into it, and a major refactor in June 2015 removed the jQuery dependency. It still has issues with IDNs.
AnchorMe is a newcomer that claims to be faster and leaner. Some IDN issues as well...
GestureDetector 手势检测拓展：旋转、缩放和滑动手势检测，自定义手势识别...
...t = join("第 ", 当前页, " 页")
}
when SwipeDetector1.SwipeLeft() {
if 当前页 < 10 {
global 当前页 = 当前页 + 1
标签_内容.Text = join("第 ", 当前页, " 页")
}
}
when SwipeDetector1.SwipeRight() {
if 当前页 > 1 {
global 当前页 = 当前页 - 1
标签_...
How to capture UIView to UIImage without loss of quality on retina display
...
The currently accepted answer is now out of date, at least if you are supporting iOS 7.
Here is what you should be using if you are only supporting iOS7+:
+ (UIImage *) imageWithView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.s...
Random Gaussian Variables
...ution. A simple implementation:
Random rand = new Random(); //reuse this if you are generating many
double u1 = 1.0-rand.NextDouble(); //uniform(0,1] random doubles
double u2 = 1.0-rand.NextDouble();
double randStdNormal = Math.Sqrt(-2.0 * Math.Log(u1)) *
Math.Sin(2.0 * Math.PI * u2);...
How do I delete from multiple tables using INNER JOIN in SQL server
...
@JohnGibb, Now that's clear. You should include that in the answer.
– Pacerier
Apr 11 '15 at 16:59
add a commen...
Delete local Git branches after deleting them on the remote repo
...swer here:
https://stackoverflow.com/a/34969726/550454
But essentially, I now have this in my ~/.gitconfig:
[alias]
prune-branches = !git remote prune origin && git branch -vv | grep ': gone]' | awk '{print $1}' | xargs -r git branch -d
...
How to use the PI constant in C++
...acro
* definitions for common math constants. These are placed under an #ifdef
* since these commonly-defined names are not part of the C/C++ standards.
*/
However:
on newer platforms (at least on my 64 bit Ubuntu 14.04) I do not need to define the _USE_MATH_DEFINES
On (recent) Linux platfo...
Why does sys.exit() not exit when called inside a thread in Python?
...
What if I did want to exit the program
from the thread?
Apart from the method Deestan described you can call os._exit (notice the underscore). Before using it make sure that you understand that it does no cleanups (like callin...
Can an enum class be converted to the underlying type?
...
I think you can use std::underlying_type to know the underlying type, and then use cast:
#include <type_traits> //for std::underlying_type
typedef std::underlying_type<my_fields>::type utype;
utype a = static_cast<utype>(my_fields::field);
With th...