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TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...查位置权限
if not WiFi1.IsLocationPermissionGranted then
call WiFi1.RequestLocationPermission
else if not WiFi1.IsGpsEnabled then
show notification "请启用GPS以扫描WiFi网络"
else if WiFi1.IsEnabled then
call WiFi1.AvailableSSIDs
else
show ...
super() in Java
Is super() used to call the parent constructor?
Please explain super() .
15 Answers
...
Function in JavaScript that can be called only once
...
If by "won't be executed" you mean "will do nothing when called more than once", you can create a closure:
var something = (function() {
var executed = false;
return function() {
if (!executed) {
executed = true;
// do something
}
...
Where is a complete example of logging.config.dictConfig?
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@MikeWilliamson: It can be useful, though, to still call getLogger() if you want multiple loggers with different names. Each of these loggers inherits configuration from the root logger.
– Elias Strehle
Nov 12 '18 at 7:40
...
Check if a row exists, otherwise insert
...row for each flight? If so:
IF EXISTS (SELECT * FROM Bookings WHERE FLightID = @Id)
BEGIN
--UPDATE HERE
END
ELSE
BEGIN
-- INSERT HERE
END
I assume what I said, as your way of doing things can overbook a flight, as it will insert a new row when there are 10 tickets max and you are booking 2...
What is __stdcall?
...
__stdcall is the calling convention used for the function. This tells the compiler the rules that apply for setting up the stack, pushing arguments and getting a return value.
There are a number of other calling conventions, __c...
How do you post to an iframe?
...some clever ninja hack; although it was deprecated (and therefore won't validate) in HTML 4 Strict or XHTML 1 Strict, it's been part of HTML since 3.2, it's formally part of HTML5, and it works in just about every browser since Netscape 3.
I have verified this behaviour as working with XHTML 1 Stri...
How can I convert an image into Base64 string using JavaScript?
...);
var dataURL;
canvas.height = this.naturalHeight;
canvas.width = this.naturalWidth;
ctx.drawImage(this, 0, 0);
dataURL = canvas.toDataURL(outputFormat);
callback(dataURL);
};
img.src = src;
if (img.complete || img.complete === undefined) {
img.src = "dat...
JavaScript displaying a float to 2 decimal places
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@Hankrecords what you said is not true. If i have '43.01' and I parseFloat then i get 43.01 BUT if i have '43.10' i will get 43.1 :D not what I want.
– Lucian Tarna
Oct 9 '18 at 15:11
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How can I swap positions of two open files (in splits) in vim?
...e 'hide buf' markedBuf
endfunction
nmap <silent> <leader>mw :call MarkWindowSwap()<CR>
nmap <silent> <leader>pw :call DoWindowSwap()<CR>
To use (assuming your mapleader is set to \) you would:
Move to the window to mark for the swap via
ctrl-w movement
Type...