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Explaining Python's '__enter__' and '__exit__'
...e which needs some 'cleandown' code executed (think of it as a try-finally block). Some more explanation here.
A useful example could be a database connection object (which then automagically closes the connection once the corresponding 'with'-statement goes out of scope):
class DatabaseConnection...
How to change href of tag on button click through javascript
...Link").onclick = function() {
document.getElementById("abc").href="xyz.php";
return false;
};
</script>
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erb, haml or slim: which one do you suggest? And why? [closed]
...or tags makes nesting tags harder as erb only returns the last line in the block. so you have to append to a string and then return that.
HAML
Pros
more concise. no closing tags, fits in smaller screens
visually cleaner structure
has built in helpers (haml_concat, haml_capture) to utilize haml...
Prevent contenteditable adding on ENTER - Chrome
...ange:
div{
background: skyblue;
padding:10px;
display: inline-block;
}
pre{
white-space: pre-wrap;
background: #EEE;
}
http://jsfiddle.net/ayiem999/HW43Q/
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offsetting an html anchor to adjust for fixed header [duplicate]
...higher or lower than where it actually appears on the page, by making it a block element and relatively positioning it. -250px will position the anchor up 250px
a.anchor {
display: block;
position: relative;
top: -250px;
visibility: hidden;
}
...
InputStream from a URL
... By default the connection will follow redirects. The following
* block is only entered if the implementation of HttpURLConnection
* does not perform the redirect. The exact behavior depends to
* the actual implementation (e.g. sun.net).
* !!! Attention: This blo...
How do I read configuration settings from Symfony2 config.yml?
...r parameters file if you deal with many bundles or if you deal with nested blocks of configuration.
First, I'll answer strictly the question.
Later, I'll give an approach for getting those configs from services without ever passing via a common space as parameters.
FIRST APPROACH: Separated conf...
Is it sometimes bad to use ?
...r> is that it's not semantic. If you want two items in different visual blocks, you probably want them in different logical blocks.
In most cases this means just using different elements, for example <p>Stuff</p><p>Other stuff</p>, and then using CSS to space the blocks o...
通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...有的 limit 信息。
-c
最大的 core 文件的大小， 以 blocks 为单位。
ulimit – c unlimited； 对生成的 core 文件的大小不进行限制。
-d
进程最大的数据段的大小，以 Kbytes 为单位。
ulimit -d unlimited；对进程的数据段大...
How do I detect a click outside an element?
....removeClass('active');
});
div {
display: none;
}
.active {
display: block;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<a href="#example">Example</a>
<div id="example" tabindex="-1">
Lorem ipsum <a href="http:/...