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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
...能。 图 2 显示了一组连接块的示例，用于创建大声朗读消息的应用程序。
图 1：App Inventor 平台的屏幕截图，其中包含设计器视图（顶部）和块编辑器视图（底部）
图 2：用于创建读取用户输入的应用程序的 App Inventor ...
Creating temporary files in bash
...e mktemp something like
mydir=$(mktemp -d "${TMPDIR:-/tmp/}$(basename $0).XXXXXXXXXXXX")
which creates a temporary directory I can work in, and in which I can safely name the actual files something readable and useful.
mktemp is not standard, but it does exist on many platforms. The "X"s will ge...
Node.js: Difference between req.query[] and req.params
...y you are receiving a GET request at /checkEmail?type=email&utm_source=xxxx&email=xxxxx&utm_campaign=XX and you want to fetch out the query used.
var type = req.query.type,
email = req.query.email,
utm = {
source: req.query.utm_source,
campaign: req.query.utm_campaign
...
How can I create directory tree in C++/Linux?
...X=mkpath.$$
** NAME=./$PREFIX/sa/32/ad/13/23/13/12/13/sd/ds/ww/qq/ss/dd/zz/xx/dd/rr/ff/ff/ss/ss/ss/ss/ss/ss/ss/ss
** : ${MKPATH:=mkpath}
** ./$MKPATH $NAME &
** [...repeat a dozen times or so...]
** ./$MKPATH $NAME &
** wait
** rm -fr ./$PREFIX/
*/
int main(int argc, char **argv)
{
int ...
Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
... s[-2,2] = "CD" # "abCD"
To replace middle two characters: s[1..3] = "XX" # "aXXd"
The behavior of a range is pretty interesting. The starting point is the
same as the first argument when two arguments are provided (as described
above) but the end point of the range can be the 'character ...
SQL Server dynamic PIVOT query?
...for CodigoFormaPago in (' + @cols + ')
) p
) xx
AJAX POST and Plus Sign ( + ) — How to Encode?
...ing you another problem, you will have one Item1 and & will be change %xx value and be as one value, see down here the return!
Example 1
$strPOST = "Item1=" . $Value1 . "&Item2=" . urlencode("+") will give Item1=Value1&Item2=%2B
Example 2
$strPOST = urlencode("Item1=" . $Value1 . "&...
What is a callback URL in relation to an API?
...any changes made by the original request if the callback doesn't return a 2xx response.
– Eric Stein
Feb 5 '16 at 2:50
...
Is there a setting on Google Analytics to suppress use of cookies for users who have not yet given c
...wing property to true before Google Analytics runs:
window['ga-disable-UA-XXXXXX-Y'] = true;
Where UA-XXXXXX-Y is your account ID in Google Analytics
As the other posters have noted, Google Analytics relies on cookies. So, you're not able to do any kind of tracking without cookies. If you've det...
REST response code for invalid data
...ndard (WebDAV) and it should be treated by browsers the same as any other 4xx status code.
From RFC 4918:
The 422 (Unprocessable Entity) status code means the server understands the content type of the request entity (hence a 415(Unsupported Media Type) status code is inappropriate), and the sy...