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App Inventor 2 中的响应式设计 · App Inventor 2 中文网
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App Inventor 2 中的响应式设计
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Responsive Design in App Inventor
version 1.0: August 15, 2015
Responsive Design in App Inventor
Specifying sizes as percentage...
Reverting a single file to a previous version in git [duplicate]
Is there a way to go through different commits on a file.
Say I modified a file 5 times and I want to go back to change 2, after I already committed and pushed to a repository.
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Can JavaScript connect with MySQL?
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No, JavaScript can not directly connect to MySQL. But you can mix JS with PHP to do so.
JavaScript is a client-side language and your MySQL database is going to be running on a server
shar...
CORS - What is the motivation behind introducing preflight requests?
Cross-origin resource sharing is a mechanism that allows a web page to make XMLHttpRequests to another domain (from wikipedia ).
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Setting variable to NULL after free
...e is a coding rule that says, after freeing any memory, reset the variable to NULL . For example ...
23 Answers
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Why is it common to put CSRF prevention tokens in cookies?
I'm trying to understand the whole issue with CSRF and appropriate ways to prevent it. (Resources I've read, understand, and agree with: OWASP CSRF Prevention CHeat Sheet , Questions about CSRF .)
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Reference: mod_rewrite, URL rewriting and “pretty links” explained
"Pretty links" is an often requested topic, but it is rarely fully explained. mod_rewrite is one way to make "pretty links", but it's complex and its syntax is very terse, hard to grok, and the documentation assumes a certain level of proficiency in HTTP. Can someone explain in simple terms how "p...
Pointers in C: when to use the ampersand and the asterisk?
...ress of a variable and that * can be used in front of a pointer variable to get the value of the object that is pointed to by the pointer. But things work differently when you're working with arrays, strings or when you're calling functions with a pointer copy of a variable. It's difficult to see ...
Save PL/pgSQL output from PostgreSQL to a CSV file
What is the easiest way to save PL/pgSQL output from a PostgreSQL database to a CSV file?
18 Answers
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git - Server host key not cached
I try to push changes from my local repo to a remote repo. When I type:
20 Answers
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