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使用照相机时老是弹出 error 201 : the camera d id not return an image ...
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引用: 参考资料：
https://community.appinventor.mi ... android-8-0/6024/14
https://github.com/mit-cml/appinventor-sources/issues/2140
AppInventor如何选相反数？ - App Inventor 2 中文网 - 清泛IT社区，为创新赋能！
问：AppInventor如何选相反数？
答：使用“数学”中的“相反数”积木：
返回给定数字的负数，若给定负数则返回正数。如：8 返回 -8，-0.7 返回 0.7，0 则仍然返回 0。
文档：https://www.fun123.cn/reference/blocks/math.html#neg
How to create a multi-tenant database with shared table structures?
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AdaTheDevAdaTheDev
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Why is the asterisk before the variable name, rather than after the type?
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123
If you look at it another way, *myVariable is of type int, which makes some sense.
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How to generate gcc debug symbol outside the build target?
... Commit=190aa9cace3b12e2b58b692f068d4f5cf22b0145
VCS: BRANCH=refs/heads/PRJ123_feature_desc
VCS: AUTHOR=Joe Developer joe.developer@somewhere.com
VCS: COMMIT_DATE=2013-12-19
All that is left is to check-out the original code, re-compile without optimizations, and start debugging.
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Why are regular expressions so controversial? [closed]
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Making Regexes Maintainable
A major advance toward demystify the patterns previously referred...
javascript pushing element at the beginning of an array [duplicate]
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123
Use .unshift() to add to the beginning of an array.
TheArray.unshift(TheNewObject);
See MDN...
Recommended way of getting data from the server
...l';
book.create();
// to retrieve a book
var bookPromise = Book.get(123);
bookPromise.then(function(b) {
book = b;
});
};
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SQL中使用update inner join和delete inner join；Oracle delete join替代...
...r join tb_Address addr on usr.nAddressFK = addr.nAddressID
where usr.id=123
update的格式是
update t1 set t1.name=’Liu’ from t1 inner join t2 on t1.id = t2.tid
MySQL，ACCESS 写法如下：
Sql代码
UPDATE mem_world AS mw1 INNER JOIN mem_world AS mw2
ON mw1.p...
Linux 搭建NTP时间同步服务器 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...火墙需要关闭，否则会阻止NTP服务端口，NTP服务默认端口123)
6、通过ntpq –p静态查看NTP服务器与外部NTP服务器同步情况。
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