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使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
创建 Apps 首页 关于我们 关于我们 发布日志 服务条款 教育 中文教程 中文社区 反馈 我要反馈 var _hmt = _hmt || []; (function() ...
How persistent is localStorage?
... cache.
Persistence
On disk until deleted by user (delete cache) or by the app
https://developers.google.com/web-toolkit/doc/latest/DevGuideHtml5Storage
As for a "replacement for the Cookie", not entirely
Cookies and local storage really serve difference purposes. Cookies are primarily for readin...
Can two applications listen to the same port?
Can two applications on the same machine bind to the same port and IP address? Taking it a step further, can one app listen to requests coming from a certain IP and the other to another remote IP?
I know I can have one application that starts off two threads (or forks) to have similar behavior, but...
How to think in data stores instead of databases?
As an example, Google App Engine uses Google Datastore, not a standard database, to store data. Does anybody have any tips for using Google Datastore instead of databases? It seems I've trained my mind to think 100% in object relationships that map directly to table structures, and now it's hard t...
用App Inventor 2做扫描仪App？从拍照到展示，手把手教你搭一套完整相机功...
用App Inventor 2做扫描仪App？从拍照到展示，手把手教你搭一套完整相机功能
上周有个做社区志愿服务的朋友问我："能不能用手机拍下老人的健康档案，然后直接在App里分类显示？"他需要一个轻量的、不给老人增加学习...
Connecting to TCP Socket from browser using javascript
I have a vb.net application that opens a socket and listens on it.
6 Answers
6
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How to check task status in Celery?
... your use case you already has the instance, you are good to go. But what happen if you only have the task id, and need to instantiate an async_result instance to be able to call async_result.get()? This is an instance of the AsyncResult class, but you cannot use the raw class celery.result.AsyncRes...
How to handle screen orientation change when progress dialog and background thread active?
...e the dialog is up (and the background thread is going). At this point the app either crashes, or deadlocks, or gets into a weird stage where the app does not work at all until all the threads have been killed.
...
How to enable cross-origin resource sharing (CORS) in the express.js framework on node.js
...
Check out the example from enable-cors.org:
In your ExpressJS app on node.js, do the following with your routes:
app.all('/', function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next();
});
a...
Xcode stops working after set “xcode-select -switch”
...
You should be pointing it towards the Developer directory, not the Xcode application bundle. Run this:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
With recent versions of Xcode, you can go to Xcode ➙ Preferences… ➙ Locations and pick one of the options for Comma...