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App Inventor 2 动态图表教程 - ECharts与Chart组件实现实时曲线图 · App Inventor 2 中文网
... 实时更新图表（配合Clock）
global 数据计数 = 0
when Screen1.Initialize() {
Clock1.TimerInterval = 1000 // 每秒更新
Clock1.TimerEnabled = true
}
when Clock1.Timer() {
global 数据计数 = 数据计数 + 1
global 随机值 = Math.random() * 100
ChartData...
AI助手重构版问题记录 - AI 助手 - 清泛IT社区，为创新赋能！
...on","dict":{"get_var": "weatherData"},"default_val":{"list":[]}}},"index": 0}},"default_val": "--"}},"°C"]}},{"set_prop": "WeatherValueLabel.Text","value":{"dict_lookup":{"key": "weatherDesc","dict":{"select_item":{"list":{"dict_lookup":{"key": "current_condition","dict":{"get_var": "weatherData"},...
Join strings with a delimiter only if strings are not null or empty
...ple:
[...].filter(x => typeof x === 'string' && x.length > 0)
will only keep non-empty strings in the list.
--
(obsolete jquery answer)
var address = "foo";
var city;
var state = "bar";
var zip;
text = $.grep([address, city, state, zip], Boolean).join(", "); // foo, bar
...
cannot find zip-align when publishing app
...f Android SDK Tools (23 which was released today) and SDK Platform-tools (20 which was also released today). I got an APK out of it, but if I tried to upload it to Google Play I got an error complaining that it is not zip aligned.
...
How do I apply a perspective transform to a UIView?
...
330
As Ben said, you'll need to work with the UIView's layer, using a CATransform3D to perform the l...
Flatten nested dictionaries, compressing keys
...t(items)
>>> flatten({'a': 1, 'c': {'a': 2, 'b': {'x': 5, 'y' : 10}}, 'd': [1, 2, 3]})
{'a': 1, 'c_a': 2, 'c_b_x': 5, 'd': [1, 2, 3], 'c_b_y': 10}
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What does %~d0 mean in a Windows batch file?
...
The magic variables %n contains the arguments used to invoke the file: %0 is the path to the bat-file itself, %1 is the first argument after, %2 is the second and so on.
Since the arguments are often file paths, there is some additional syntax to extract parts of the path. ~d is drive, ~p is the...
Find the host name and port using PSQL commands
...
60
The default PostgreSQL port is 5432. The host that the database is operating on should have bee...
Could not load type 'System.Runtime.CompilerServices.ExtensionAttribute' from assembly 'mscorlib
...
10 Answers
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How to avoid scientific notation for large numbers in JavaScript?
...tific notation if the number is >= 1e21 and has a maximum precision of 20. Other than that, you can roll your own, but it will be messy.
function toFixed(x) {
if (Math.abs(x) < 1.0) {
var e = parseInt(x.toString().split('e-')[1]);
if (e) {
x *= Math.pow(10,e-1);
x = ...