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5分钟了解 App Inventor 2：不会写代码，也能做出自己的 App - App应用开发...
...仪、相机、蓝牙——手机上的硬件都能用
3. 网络通信：HTTP请求、Firebase实时数据库、MQTT物联网协议
4. 数据存储：本地TinyDB、云端Firebase、自定义Web数据库
5. 多媒体：文字转语音、语音识别、图片处理、视频播放
6. 社交功能...
Standard alternative to GCC's ##__VA_ARGS__ trick?
...ORMORE, TWOORMORE, ONE, throwaway)
#define SELECT_10TH(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, ...) a10
int
main(int argc, char *argv[])
{
BAR("first test");
BAR("second test: %s", "a string");
return 0;
}
This same trick is used to:
count the number of arguments
expand differently...
Check if a key exists inside a json object
...thisSession)==false)
{
// do nothing.
}
else
{
alert("yeah");
}
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in
http://www.w3schools.com/jsref/jsref_operators.asp
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...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
...rier Transform. For the example above, we get the polynomial q(x) = x16 + 2x13 + 2x12 + 3x10 + 4x9 + x8 + 2x7 + 4x6 + 2x5 + x4 + 2x3 + x2. This step is O(n log n).
Ignore all terms except those corresponding to x2k for some k in L. For the example above, we get the terms x16, 3x10, x8, x4, x2. This ...
jQuery AJAX cross domain
.... Setting it to * will accept cross-domain AJAX requests from any domain. (https://developer.mozilla.org/en/http_access_control)
The method to do this will vary from language to language, of course. Here it is in Rails:
class HelloController < ApplicationController
def say_hello
headers['...
App Inventor 2 扩展开发实战：从Java小白到发布第一个.aix自定义插件 - Ap...
...s/AltCamera.aix
5. 导入测试
打开 https://www.fun123.cn ，新建项目 -> 组件面板底部点击"Import extension" -> 选择本地的 AltCamera.aix -> 确认导入后，组件就会出现在"拓展"分类中，跟普通Camera一样使用。
St...
What is the list of supported languages/locales on Android?
...t, not just for instances returned by the various lookup methods. See also https://issuetracker.google.com/issues/36908826.
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How to pip or easy_install tkinter on Windows
... answered Oct 1 '17 at 7:58
cn123hcn123h
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Why am I seeing an “origin is not allowed by Access-Control-Allow-Origin” error here? [duplicate]
...
XMLHttpRequest will not let you reach localhost:8080 because of the "same origin policy".
You can allow requests from modern browsers by adding a header to your response on localhost:8080:
Access-Control-Allow-Origin: *
You ...
What's the Point of Multiple Redis Databases?
...is. See his comment here:
https://groups.google.com/d/topic/redis-db/vS5wX8X4Cjg/discussion
I understand how this can be useful, but unfortunately I consider
Redis multiple database errors my worst decision in Redis design at
all... without any kind of real gain, it makes the internals a ...