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GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
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注意事项
Image组件必需：扩展需要一个Image组件来显示GIF
文件路径：资源文件只需文件名，SD卡文件需绝对路径
透明效果：需要根据GIF背景色选择合适的透明颜色
内存考虑：大尺寸或高帧数GIF可能消...
MySQL Workbench: How to keep the connection alive
Error Code: 2013. Lost connection to MySQL server during query
9 Answers
9
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Comet implementation for ASP.NET? [closed]
...met's persistent connectivity, but there is a team looking at Comet scenarios now. Also look at Aaron Lerch's blog as I believe he's done some early Comet work in ASP.NET.
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JavaScript: Overriding alert()
...the func and ensure it doesn't get tampered with!
– Josh Stodola
Nov 13 '09 at 15:15
15
Ugh! appl...
Navigation bar appear over the views with new iOS7 SDK
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That’s not entirely true. There has been a new property introduced in iOS 7 that lets you adjust the layout behavior as in previous versions of iOS. Place this piece of code in your view controller, and you should be good to go! The space your navigation bar takes up should be accounted for auto...
How do I remove all .pyc files from a project?
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Most importantly, if this is a dev machine, you can set PYTHONDONTWRITEBYTECODE=True, and you'll never need to do this again. See: this answer.
– mlissner
May 30 '11 at 0:46
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Alternatives to JavaScript
...nd there's a bit of a learning curve, but it's not the language's fault.
Most people assume that Javascript is like Java because it has similar syntax and a similar name, but actually it's a lot more like lisp. It's actually pretty well suited to DOM manipulation.
The real problem is that it's com...
How do you scroll up/down on the Linux console?
... edited Jun 28 '17 at 8:52
LostMyGlasses
2,4021313 silver badges2626 bronze badges
answered Mar 6 '13 at 18:36
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How do I generate random numbers in Dart?
...ich delegates to window.crypto.getRandomValues() in the browser and to the OS (like urandom on the server)
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How to delete a file from SD card?
...String fullname)
{
// Note: check outside this class whether the OS version is >= 11
Uri uri = null;
Cursor cursor = null;
ContentResolver contentResolver = null;
try
{
contentResolver=context.getContentResolver();
if (contentResolve...