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App Inventor 2 CustomWebView 拓展：高级版Web浏览器，完美浏览现代Web前...
...sed when something is long clicked in webview with item(image,string,empty,etc) and type(item type like 0,1,8,etc)
OnCloseWindowRequest(id)
Event triggered when a window needs to be closed
OnConsoleMessage(message,lineNumber,sourceID,level)
Event raised after getting console message.
OnDow...
Why JavaScript rather than a standard browser virtual machine?
Would it not make sense to support a set of languages (Java, Python, Ruby, etc.) by way of a standardized virtual machine hosted in the browser rather than requiring the use of a specialized language -- really, a specialized paradigm -- for client scripting only?
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Should functions return null or an empty object?
...p -- the throwing method needs to know more about where that ID came from, etc.
– Jacob Mattison
Oct 26 '09 at 18:50
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...most/some/? linux distributions. Some define it as an alias ll='ls -l' in /etc/bash.bashrc or /etc/.bashrc. Thus it may not work and it may not exists on OPs system. Use ls -l -Rt at least, as ls is a standard command as defined by posix. Or specify you meant alias ll='ls -l'; ll -Rt.
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Can I serve multiple clients using just Flask app.run() as standalone?
... or use some out-of-band communication (Redis, a database, the filesystem, etc.) so that each of your processes stays synced.
– Sean Vieira
Feb 12 '13 at 11:13
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ActiveRecord: size vs count
...of new messages, total elements when only a page is going to be displayed, etc.
length
Loads the required data, i.e. the query as required, and then just counts it. The way to go if you are using the data.
Example: Summary of a fully loaded table, titles of displayed data, etc.
size
It checks i...
Are multiple `.gitignore`s frowned on?
...single asterisk) in that directory and it will never show up in git status etc.
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What are the differences between git branch, fork, fetch, merge, rebase and clone?
... of merging file changes (within the same file!) together during pulls or fetches/pushes to a remote repository such as GitHub. The only time you need to do manual changes (actually editing a file) is if two changes involve the same line(s) of code.
Branches
Branches allow you to preserve the ...
How many bytes does one Unicode character take?
.... Those are the various unicode encodings, such as utf-8, utf-16le, utf-32 etc. They are distinguished largely by the size of of their codeunits. UTF-32 is the simplest encoding, it has a codeunit that is 32bits, which means an individual codepoint fits comfortably into a codeunit. The other encodin...
How does facebook, gmail send the real time notification?
...opic and the answers are comet, reverse ajax, http streaming, server push, etc.
5 Answers
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