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浅谈HTML5 & CSS3的新交互特性 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...成更多的交互，例如绘制图形、放大缩小，等等。图例是一个用HTML5制作的小游戏。
5. 地理(Geolocation) API
HTML5提供了地理信息的应用接口 Geolocation API。通过这个API，网页可以通过IP，GPS等方式来获得用户的地理信息；同时用户...
上线当天App就崩了，才发问题是手机网络超时没处理——用App Inventor 2的W...
...tion/json才能正确返回。通过Web组件的请求标头属性，设置一个双元素列表((Content-Type application/json))即可。
关键实现
核心积木拼装过程：
• 按钮点击事件：先检查输入框是否为空 → 设置Web组件的URL网址属性（关键词用URI...
How to set NODE_ENV to production/development in OS X
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Refer to npmjs.com/package/cross-env for a simple cross-platform solution. cross-env NODE_ENV=production works on windows and linux / mac.
– AntonB
Jun 4 '16 at 13:55
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How does delete[] know it's an array?
...lly, using delete[] to delete something created with new is exploitable. taossa.com/index.php/2007/01/03/…
– Rodrigo
Apr 24 '09 at 13:20
23
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我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
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技术方案
硬件端
- 遥控车原有电路不动，额外并联一个HC-05蓝牙模块
- HC-05的TX/RX接Arduino Nano的RX/TX（注意交叉）
- Arduino读取蓝牙数据后，通过MOS管驱动原有遥控车的电机控制信号
软件端（App Inventor 2）
核心组件清单...
How to simulate Android killing my process
Android will kill a process if it is in the background and the OS decides it needs the resources (RAM, CPU, etc.). I need to be able to simulate this behaviour during testing so that I can ensure that my application is behaving correctly. I want to be able to do this in an automated way so that I ca...
Expand Python Search Path to Other Source
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There are a few possible ways to do this:
Set the environment variable PYTHONPATH to a colon-separated list of directories to search for imported modules.
In your program, use sys.path.append('/path/to/search') to add the names of directori...
How to measure time taken by a function to execute
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Using performance.now():
var t0 = performance.now()
doSomething() // <---- The function you're measuring time for
var t1 = performance.now()
console.log("Call to doSomething took " + (t1 - t0) + " milliseconds.")
NodeJs: it is required to import the performance clas...
Programmatically obtain the Android API level of a device?
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What you need: http://developer.android.com/reference/android/os/Build.VERSION_CODES.html
SDK_INT value Build.VERSION_CODES Human Version Name
1 BASE Android 1.0 (no codename)
2 BASE_1_1 ...
Objective-C : BOOL vs bool
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From the definition in objc.h:
#if (TARGET_OS_IPHONE && __LP64__) || TARGET_OS_WATCH
typedef bool BOOL;
#else
typedef signed char BOOL;
// BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C"
// even if -funsigned-char is used.
#endif
#define...