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Arduino控制RGB三色LED灯实验、程序代码、连线图、仿真 - 创客硬件开发 - ...
...含红绿蓝三种，通过控制红（R）、绿(B)、蓝(G)三种颜色的变化使其相互叠加产生花式颜色。而其颜色值的输出是通过PWM来控制的。RGB三基色按照不同的比例相加合成混色称为相加混色，除相加混色法之外还有相减混色法。
PWM控...
AppInventor2添加超过10个屏幕会怎样？ - App Inventor 2 中文网 - 清泛IT...
...加更多屏幕，但最好也不要添加太多屏幕，因为多个屏幕的应用程序将非常消耗计算资源，并且很容易超出 App Inventor 的限制。根据经验，任何单个应用程序中的屏幕不应超过 10 个，当你尝试超过此限制时，App Inventor 会警告你...
“信息分享器”误点了始终按钮，还能恢复初始的选择选项吗？ - App应用开发...
Q：分享器打开后原有很多可选的APP，包括微信，地图等等，对话框下有（始终）和（仅一次），误点了（始终），则再次打开就只有一种选择，重新安装后也是如此，换个手机就又好了，但是如再次点击（始终）选择，则这个...
Back to previous page with header( “Location: ” ); in PHP
... PHP page visitor back to their previous page with the header( "Location: URL of previous page" );
6 Answers
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Python: how to print range a-z?
...ghijklmn'
>>> string.ascii_lowercase[:14:2]
'acegikm'
To do the urls, you could use something like this
[i + j for i, j in zip(list_of_urls, string.ascii_lowercase[:14])]
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How to get JavaScript caller function line number? How to get JavaScript caller source URL?
I am using the following for getting the JavaScript caller function name:
15 Answers
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Proper MIME type for OTF fonts
...he following order:
@font-face {
font-family: 'my-web-font';
src: url('webfont.eot');
src: url('webfont.eot?#iefix') format('embedded-opentype'),
url('webfont.woff2') format('woff2'),
url('webfont.woff') format('woff'),
url('webfont.ttf') format('truetype'),
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How do you query for “is not null” in Mongo?
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This will return all documents with a key called "IMAGE URL", but they may still have a null value.
db.mycollection.find({"IMAGE URL":{$exists:true}});
This will return all documents with both a key called "IMAGE URL" and a non-null value.
db.mycollection.find({"IMAGE URL":{$ne:n...
How to checkout a specific Subversion revision from the command line?
...
Either
svn checkout url://repository/path@1234
or
svn checkout -r 1234 url://repository/path
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Git in Visual Studio - add existing project?
...ed in your Team Foundation Server account git remote add origin <proper URL>
git push your code
Alternatively, there are detailed guides here using the Visual Studio integration.
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