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Is “IF” expensive?
... what exactly our teacher said that day and I'm hoping you would probably know.
16 Answers
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图片处理使用指导 · App Inventor 2 中文网
...理1.AddTextWatermark(图像位址, 计时器1.FormatDateTime(计时器1.Now(), "yyyy-MM-dd HH:mm"), &HFFFFFFFF, 0, "右下")
}
要点：
字号填 0 时按图片宽度自动（约宽度的 1/20），不同分辨率的照片水印比例一致；
位置可填 左上、右上、左下、右下...
How do we control web page caching, across all browsers?
..." content="0">
HTML meta tags vs HTTP response headers
Important to know is that when an HTML page is served over an HTTP connection, and a header is present in both the HTTP response headers and the HTML <meta http-equiv> tags, then the one specified in the HTTP response header will get...
How can I make a JPA OneToOne relation lazy
...t bytecode instrumentation. The reason for this is that owner entity MUST know whether association property should contain a proxy object or NULL and it can't determine that by looking at its base table's columns due to one-to-one normally being mapped via shared PK, so it has to be eagerly fetched ...
What is the garbage collector in Java?
...ated in the previous iteration is not being used anymore -- that object is now considered "garbage".
Eventually, we'll start getting a lot of garbage, and memory will be used for objects which aren't being used anymore. If this keeps going on, eventually the Java Virtual Machine will run out of spa...
How to use OpenSSL to encrypt/decrypt files?
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NOTE: PBKDF2 is now part of the openssl enc (finally). However the iteration count is extrememly low, and needs to be set to a much higher level. If that count is randomised, then you also get a extra level of 'saltiness' to your encryption...
How to properly reuse connection to Mongodb across NodeJs application and modules
... I tried this code but I got null when do mongoUtil.getDb(), I don't know why is that.
– Keming
Jan 17 '18 at 19:44
3
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JavaScript + Unicode regexes
...d among browser vendors you're still on your own, though. Update: There is now a transpiler named regexpu that translates ES6 Unicode regular expressions into equivalent ES5. It can be used as part of your build process. Try it out online.
Situation for ES 5 and below
Even though JavaScript operates...
Python 3: ImportError “No Module named Setuptools”
...ols. Some Python packages used to use distutils for distribution, but most now use setuptools, a more complete package. Here is a question about the differences between them.
To install setuptools on Debian:
sudo apt-get install python3-setuptools
For an older version of Python (Python 2.x):
su...
HTML5 best practices; section/header/aside/article elements
...enough information about HTML5 on the web (and also on stackoverflow), but now I'm curious about the "best practices". Tags like section/headers/article are new, and everyone has different opinions about when/where you should use these tags. So what do you guys think of the following layout and code...