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AppInventor如何扫二维码？扫码结果如何与Web进行交互？ - App Inventor 2 ...
...码怎么实现？
[hide]A：使用“条码扫描器”组件：https://www.fun123.cn/reference/ ... html#BarcodeScanner
属性“使用外部扫描”设置为假，其他没有啥要注意的。就调用一下扫描方法，就能使用摄像头扫二维码。
Q：...
Embed SVG in SVG?
...height="100%" viewBox="-100 -100 200 200" version="1.1"
xmlns="http://www.w3.org/2000/svg">
<circle cx="-50" cy="-50" r="30" style="fill:red" />
<image x="10" y="20" width="80" height="80" href="recursion.svg" />
</svg>
...
Convert Object to JSON string
...the reverse. Object is to be converted to JSON string
I got a link http://www.devcurry.com/2010/03/convert-javascript-object-to-json.html
but it need to have json2.js do jQuery has a native method to do this?
...
POST data to a URL in PHP
...l form) it can be done with curl. It will look like this:
$url = 'http://www.someurl.com';
$myvars = 'myvar1=' . $myvar1 . '&myvar2=' . $myvar2;
$ch = curl_init( $url );
curl_setopt( $ch, CURLOPT_POST, 1);
curl_setopt( $ch, CURLOPT_POSTFIELDS, $myvars);
curl_setopt( $ch, CURLOPT_FOLLOWLOCATIO...
MySQL convert date string to Unix timestamp
...
From http://www.epochconverter.com/
SELECT DATEDIFF(s, '1970-01-01 00:00:00', GETUTCDATE())
My bad, SELECT unix_timestamp(time) Time format: YYYY-MM-DD HH:MM:SS or YYMMDD or YYYYMMDD. More on using timestamps with MySQL:
http://www.ep...
Return HTTP status code 201 in flask
...his small issue
also here is list of status code followed globally
http://www.w3.org/Protocols/HTTP/HTRESP.html
Hope it helps.
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String to Dictionary in Python
...","name":"John Doe","first_name":"John","last_name":"Doe","link":"http:\/\/www.facebook.com\/jdoe","gender":"male","email":"jdoe\u0040gmail.com","timezone":-7,"locale":"en_US","verified":true,"updated_time":"2011-01-12T02:43:35+0000"}"""
>>> json.loads(s)
{u'first_name': u'John', u'last_nam...
How to set the maxAllowedContentLength to 500MB while running on IIS7?
... bytes (28.6 MB)
Max. value 4294967295 bytes (4 GB)
References:
http://www.whatsabyte.com/P1/byteconverter.htm
https://www.iis.net/configreference/system.webserver/security/requestfiltering/requestlimits
Example:
<location path="upl">
<system.web>
<!--The default siz...
Newline in JLabel
...e the MultilineLabel component in the Jide Open Source Components.
http://www.jidesoft.com/products/oss.htm
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Named routes _path vs _url
...dd that you should also use _url in redirects, as explained here:
https://www.ruby-forum.com/topic/101346#221052
and, here:
http://viget.com/extend/rails-named-routes-path-vs-url
You can also take a look at the relevant section of the HTTP specification here:
http://www.w3.org/Protocols/rfc261...