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将 App Inventor 2 项目连接到外部传感器 · App Inventor 2 中文网
...ect in the MIT Department of Electrical Engineering and Computer Science. Funding to support this work was provided by Google ATAP
Introduction
App Inventor is a visual “blocks” based language for programming Android apps. It gives users the ability to easily learn, create, and prototype in a ...
Why shouldn't I use mysql_* functions in PHP?
...es
Stored procedures
Multiple Statements
Transactions
The "new" password authentication method (on by default in MySQL 5.6; required in 5.7)
Any of the new functionality in MySQL 5.1 or later
Since it is deprecated, using it makes your code less future proof.
Lack of support for prepared statem...
- how to allow only one item selected?
...: 1 on the select will cause it to treat size="3" as a minimum height, and then snap the height of the whole select to the maximum size possible within your container. jsfiddle.net/z1gypahs
– Torxed
Nov 16 '19 at 23:53
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Application Crashes With “Internal Error In The .NET Runtime”
...te, misbehaving malware scanners are notorious. If it repeats very poorly then suspect hardware problems like soft RAM errors.
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Changing the browser zoom level
... don't care much about user experience.
If you need a more reliable zoom, then consider zooming the page fonts and images with JavaScript and CSS, or possibly on the server side. The image and layout scaling issues could be addressed this way. Of course, this requires a bit more work.
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Replace multiple whitespaces with single whitespace in JavaScript string
...inning or end of the string. If you only want to trim spaces from the end, then the regex would look like this instead:
mystring = mystring.replace(/\s+$/g,' ');
Hope that helps.
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How can I specify the base for Math.log() in JavaScript?
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Math.log10 = function(n) {
return (Math.log(n)) / (Math.log(10));
}
Then you can do
Math.log10(your_number);
NOTE: Initially I thought to do Math.prototype.log10 = ... to do this, but user CMS pointed out that Math doesn't work this way, so I edited out the .prototype part.
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How do I add PHP code/file to HTML(.html) files?
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to httpd.conf file for what you want to do.
But remember, if you do this then your web server will be very slow, because it will be parsing even static code which will not contain php code.
So the better way will be to make the file extension .phtml instead of just .html.
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How do I get the current line number?
....Format("{0}({1}): {2}: {3}", fileName, lineNumber, methodName, message)); then you can click the line in the output window and be taken to that line in the source.
– Jesse Chisholm
Jan 14 '16 at 22:16
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String isNullOrEmpty in Java? [duplicate]
...ing just has whitespace(s). What does "empty" means in real world ? Sounds fun to me!
– asyncwait
Feb 27 '14 at 15:01
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