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社交应用组件 · App Inventor 2 中文网
...选择框.电话号码 属性。
要直接指定电话号码（例如 021-12345678），请将 电话号码 属性设置为具有指定数字的文本（例如“02112345678”）。
属性
电话号码
指定要拨打的电话号码。
事件
来电已接听时(电话号码)
指示...
Colors in JavaScript console
...36px 121px hsl(653.4, 100%, 50%), -38px 122px hsl(658.8, 100%, 50%), -39px 123px hsl(664.2, 100%, 50%), -41px 124px hsl(669.6, 100%, 50%), -42px 125px hsl(675, 100%, 50%), -43px 126px hsl(680.4, 100%, 50%), -45px 127px hsl(685.8, 100%, 50%), -46px 128px hsl(691.2, 100%, 50%), -47px 129px hsl(696.6, ...
PHP parse/syntax errors; and how to solve them
... trying to dereference constants (before PHP 5.6) as arrays:
$var = const[123];
⇑
At least PHP interprets that const as a constant name.
If you meant to access an array variable (which is the typical cause here), then add the leading $ sigil - so it becomes a $varname.
You are trying to...
Programmatically Lighten or Darken a hex color (or rgb, and blend colors)
... and accepts standard RGB colors in the form of strings. For example: "rgb(123,45,76)" or "rgba(45,15,74,0.45)".
Shades colors to white or black by percentage.
Blends colors together by percentage.
Does Hex2RGB and RGB2Hex conversion at the same time, or solo.
Accepts 3 digit (or 4 digit w/ alpha) H...
What does the `forall` keyword in Haskell/GHC do?
...
123
Can anybody completely explain the forall keyword in clear, plain English?
No. (Well, may...
In Java, what is the best way to determine the size of an object?
...
123
You should use jol, a tool developed as part of the OpenJDK project.
JOL (Java Object Layo...
List comprehension vs map
...
10000 loops, best of 3: 181/118/123 usec per loop ^^^^^^^^^^^^^^^^^^
for list(<generator>), probably optimized
% python3 -mtimeit -s 'xs=range(1000)' 'f=lambda x:x' 'z=list(f(x) for x in xs)' ...
How to parse freeform street/postal address out of text, and into components
...04 60203
Even these are possibly valid:
4) 829 LKSDFJlkjsdflkjsdljf Bkpw 12345
5) 205 1105 14 90210
Obviously, these are not standardized. Punctuation and line breaks not guaranteed. Here's what's going on:
Number 1 is complete because it contains a street address and a city and state. With th...
Android: Want to set custom fonts for whole application not runtime
...
123
+50
EDIT: S...
What is an existential type?
...ing> mc1 = new MyClass("foo");
MyClass<Integer> mc2 = new MyClass(123);
MyClass<?> mc3 = MyClass.secretMessage();
From the perspective of a client of MyClass, T is universal because you can substitute any type for T when you use that class and you must know the actual type of T whe...