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App Inventor 2 ECharts 拓展：基于 ECharts 强大的个性化数据图表展示 · ...
...列表； datas：二维列表，每项为[x下标,y下标,数值]。
Candlestick(title,labels,datas)
画K线图(蜡烛图)。labels：日期类目列表； datas：二维列表，每项为[开盘,收盘,最低,最高]。
Progress(title,value)
画进度环(百分比仪表)。value：进度...
SensorUtil 传感器工具扩展：在后台和屏幕关闭时保持传感器工作 · App Inv...
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工作原理
前台服务
Android 限制后台应用的活动以节省电池。要在后台持续运行，应用必须启动前台服务。前台服务会在状态栏显示通知，告知用户应用正在后台运行。
传感器生命...
How do you find the current user in a Windows environment?
When running a command-line script, is it possible to get the name of the current user?
13 Answers
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How to checkout a specific Subversion revision from the command line?
... to checkout a specific revision of a folder in Subversion using the command line.
10 Answers
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C++ Singleton design pattern
... the Singleton design pattern that is lazy-evaluated, correctly-destroyed, and thread-safe.
class S
{
public:
static S& getInstance()
{
static S instance; // Guaranteed to be destroyed.
// Instantiated on first use.
...
Best way to detect when a user leaves a web page?
... answered Sep 29 '08 at 7:02
Andreas PeterssonAndreas Petersson
15.3k1111 gold badges5656 silver badges9090 bronze badges
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.NET - Dictionary locking vs. ConcurrentDictionary
... locking, or rather explicit access in some way or another.
On the other hand, consider a store with a clerk at a desk, and you can only shop through him. You get in line, and ask him for an item, he brings it back to you, and you go out of the line. If you need multiple items, you can only pick up...
\d is less efficient than [0-9]
...code escapes are still valid in ECMAScript (\u1234). It's "just" the shorthand character classes that change meaning (like \d) and the Unicode property/script shorthands that go away (like \p{N}).
– Tim Pietzcker
May 20 '13 at 9:51
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Python's many ways of string formatting — are the older ones (going to be) deprecated?
...
While there are various indications in the docs that .format and f-strings are superior to % strings, there's no surviving plan to ever deprecate the latter.
In commit Issue #14123: Explicitly mention that old style % string formatting has caveats but is not going away any time soon.,...
Can local storage ever be considered secure? [closed]
... now reasonably well supported.
For an offline app, you must still design and implement a secure keystore.
Aside: If you are using Node.js, use the builtin crypto API.
Native-Javascript Cryptography (pre-WebCrypto)
I presume the primary concern is someone with physical access to the computer rea...