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App Inventor 2 地图与电子围栏教程 - LocationSensor与地图组件 · App Inventor 2 中文网
...LocationSensor 持续获取位置，计算与围栏中心的距离，判断是否在围栏内。
计算两点间距离（Haversine公式）
function calculateDistance(lat1, lon1, lat2, lon2) {
var R = 6371000 // 地球平均半径（米）
var dLat = (lat2 - lat1) * 3.14...
Arduino101 脉冲宽度调制 · App Inventor 2 中文网
...101的BluetoothLE组件。
On – 获取Arduino 101连接的设备是否开启。这是根据蓝牙低功耗组件的连接状态以及之前TurnOn和TurnOff调用的最佳猜测。
Speed – 脉冲宽度调制的速率，以时间百分比表示。0表示始终关闭状态，50表...
What is the email subject length limit?
...en you get this surprise from OutLook. Bit if you don't add the ISOs, then iPhone email will not understand it(and attach files with names using such characters will not work on iPhones).
share
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im...
AccessibilityTools 无障碍工具扩展：执行返回、主页和最近任务等操作 · A...
...无障碍权限()
请求无障碍权限。
IsPermissionGranted权限是否已授予()
检查权限是否已授予。
属性
无
事件
无
参考资料
Android AccessibilityService API 参考
版权...
How can I produce an effect similar to the iOS 7 blur view?
...
This does not work on iPhone 4 running iOS 7. It is probably because on iPhone 4, since the GPU power is too low, the system does not add the usual blur effect to it's UITabBar itself.
– Ayush Goel
Feb 6 '14 ...
Browser detection in JavaScript? [duplicate]
...n the navigator.userAgent and quite well tested for all browsers including iphone, android etc.
https://github.com/ded/bowser
You can use simply say:
if (bowser.msie && bowser.version <= 6) {
alert('Hello IE');
} else if (bowser.firefox){
alert('Hello Foxy');
} else if (bowser.chr...
iOS: Access app-info.plist variables in code
... XCode automatically populates the key 'UIMainStoryboardFile' with the iPhone / iPad Storyboard files, depending on the device :)
– sherlock
Mar 16 '12 at 10:19
add a comm...
Easiest way to detect Internet connection on iOS?
...at doesn't mean you're actually able to connect. Example: you connect your iPhone's wifi to your camera's wifi. Wifi is connected with a default gateway: all hosts will report reachable. But they are actually not -- the camera is a dead-end connection.
– xaphod
...
“Adobe Flash Player因过期而遭到阻止”的内幕起因和解决办法 - 更多技术 ...
...查看一下浏览器插件列表，确认一下18.0.0.209的Flash Player是否替换掉旧版本。这个很关键，因为很多浏览器在适配插件上存在问题，所以大家安装完后一定要确认Flash新版本已经适配到位。
我就拿Chrome举例，Chrome用户安装完新版...
在线服务的黑天鹅 - 资讯 - 清泛网 - 专注C/C++及内核技术
...一个地方再次踩坑。同时也可以反思团队在项目中的表现是否达到了平均以上的水平，是否存在一些低级错误？
在另外一方面，如果问题超出了之前的认知及应对策略的范围，属于黑天鹅式的问题，则没必要太多的自责。具有...