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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...AI2组件对象
【Hash】文件Hash拓展：文件哈希计算和 Base64 编码文件，sha256、sha512 哈希
【向量计算】VectorArithmetic 拓展：计算两个向量相加的结果向量
【手机管理】App Inventor 2 TaifunTM 拓展：获取本机手机号码
【电池管理】Ap...
What does ~~ (“double tilde”) do in Javascript?
.... It does not round any numbers.
Math.trunc(13.37) // 13
Math.trunc(42.84) // 42
Math.trunc(0.123) // 0
Math.trunc(-0.123) // -0
Math.trunc("-1.123")// -1
Math.trunc(NaN) // NaN
Math.trunc("foo") // NaN
Math.trunc() // NaN
The polyfill:
function trunc(x) {
return x <...
How to encrypt String in Java
...you get the key. That simple!
Pointed out by Moussa
I am using Sun's Base64Encoder/Decoder which is to be found in Sun's JRE, to avoid yet another JAR in lib. That's dangerous from point of using OpenJDK or some other's JRE. Besides that, is there another reason I should consider using Apache comm...
.NET Process.Start default directory?
...
umlcat
3,89633 gold badges1616 silver badges2727 bronze badges
answered Sep 22 '08 at 13:46
Dror HelperDror Hel...
How to auto-remove trailing whitespace in Eclipse?
...nes or ignoring empty lines - really annoying.
– Thor84no
Feb 12 '14 at 13:06
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Difference between int32, int, int32_t, int8 and int8_t
...ent times, both 16 bits and 32 bits have been reasonably common (and for a 64-bit implementation, it should probably be 64 bits).
On the other hand, int is guaranteed to be present in every implementation of C, where int8_t and int32_t are not. It's probably open to question whether this matters to...
Breakpoint on property change
...serve(myObj, func);
myObj.a = 42;
Object.unobserve(myObj, func);
myObj.a = 84;
Note that when using Object.observe, you'll not be notified when the assignment didn't change anything, e.g. if you've written myObj.a = 1.
To see the call stack, you need to enable "async call stack" option in Dev Too...
How Big can a Python List Get?
...o Justen's answer indicates) that on other machines, notably those running 64-bit systems, the value of PY_SSIZE_T_MAX can very greatly.
– ClydeTheGhost
Aug 8 '16 at 18:46
...
How to set button click effect in Android?
...
84
Create your AlphaAnimation Object that decides how much will be the fading effect of the button...
How can you zip or unzip from the script using ONLY Windows' built-in capabilities?
..., one can write scripts to achieve this, see
https://stackoverflow.com/a/26843122/71312
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