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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...e function Detect is fired when the user performs a gesture, and returns a string which is the name of the recognized gesture. If no gesture is detected, the returned string is empty. The function EnableDetection and DisableDetection are used to switch on and off the detection respectively.
Figure ...
How to delete duplicate lines in a file without sorting it in Unix?
...hen seen[$0] == 2, and so on.
Awk evaluates everything but 0 and "" (empty string) to true. If a duplicate line is placed in seen then !seen[$0] will evaluate to false and the line will not be written to the output.
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Use of .apply() with 'new' operator. Is this possible?
...native constructors that behave differently when called as functions, like String, Number, Date, etc.) with an array of arguments:
function construct(constructor, args) {
function F() {
return constructor.apply(this, args);
}
F.prototype = constructor.prototype;
return new F...
How to generate random SHA1 hash to use as ID in node.js?
...er to ensure hash uniqueness:
var current_date = (new Date()).valueOf().toString();
var random = Math.random().toString();
crypto.createHash('sha1').update(current_date + random).digest('hex');
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Best way to test exceptions with Assert to ensure they will be thrown
...e );
}
catch (Exception e)
{
Assert.Fail(
string.Format( "Unexpected exception of type {0} caught: {1}",
e.GetType(), e.Message )
);
}
}
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...
Mixin vs inheritance
...riety of parent classes. Mixins may call a method (for example sayHello(): String) even though they do not define such a method.
mixin M {
name: String
defmethod greetings() { print sayHello() + " " + name}
}
As you see, you can call sayHello() even though it is not defined anywhere. If ...
Sending multipart/formdata with jQuery.ajax
...g jQuery not to add a Content-Type header for you, otherwise, the boundary string will be missing from it.
Also, you must leave the processData flag set to false, otherwise, jQuery will try to convert your FormData into a string, which will fail.
You may now retrieve the file in PHP using:
$_FILES...
Google Map API V3: How to add Custom data to markers
...ou may add custom information in the form key: value, where key is a valid string. They are called object properties and can be approached in many different ways. The value can be anything legal, as simple as numbers or strings, and also functions, or even other objects. Three simple ways: in the de...
Remove redundant paths from $PATH variable
... your command sets the PATH to - $PATH(the current value of PATH) + the string /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games. If you want to have just the String, remove $PATH + the semicolon (:) from your command. It doesn't matter if you use echo or edit the file...
Load “Vanilla” Javascript Libraries into Node.js
...opied to './libs/apprise.js'. Then where it starts with
function apprise(string, args, callback){
I assigned the function to module.exports = thus:
module.exports = function(string, args, callback){
Thus I'm able to import the library into my code like this:
window.apprise = require('./libs/...