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Do DOM tree elements with ids become global variables?
...l>
<html>
<head>
</head>
<body>
<div id="im_not_particularly_happy_with_that">
Hello World!
</div>
<script>
im_not_particularly_happy_with_that.innerText = 'Hello Internet!';
</script>
<!-- Looking at you W3 HTML5 spec group ಠ...
How would you implement an LRU cache in Java?
...mple = Collections.synchronizedMap(new LruCache<String, String>(CACHE_SIZE));
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What are the differences between type() and isinstance()?
...ne is not better; they are for different things.
– EL_DON
Apr 30 '17 at 2:30
Please can you tell me - why have you use...
What is the difference between ng-app and data-ng-app?
...They expect non default HTML attributes to be prefaced with
data-attribute_name_here.
So, the creators of AngularJS have created alternate names for their directives that include the data- in front of them so that HTML validator programs will "like" them.
...
What are the -Xms and -Xmx parameters when starting JVM?
... binary powers rather than powers of ten. See en.wikipedia.org/wiki/Binary_prefix. In addition, because some unusable space is set aside for an extra pool of Survivor space, the amount of memory actually available according to Runtime.getRuntime().maxMemory() is less than the value specified via -...
How to check if an object is an array?
...e jQuery.isArray(obj) or $.isArray(obj). If you use underscore you can use _.isArray(obj)
If you don't need to detect arrays created in different frames you can also just use instanceof
obj instanceof Array
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正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...代表的含意与\d就是完全一致的：一位数字；同理[a-z0-9A-Z_]也完全等同于\w（如果只考虑英文的话）。
下面是一个更复杂的表达式：\(?0\d{2}[) -]?\d{8}。
“(”和“)”也是元字符，后面的分组节里会提到，所以在这里需要使用转义...
Reducing Django Memory Usage. Low hanging fruit?
...ents the python garbage collector from releasing the memory.
Don't use mod_python. It loads an interpreter inside apache. If you need to use apache, use mod_wsgi instead. It is not tricky to switch. It is very easy. mod_wsgi is way easier to configure for django than brain-dead mod_python.
If you ...
How do I check if a directory exists? “is_dir”, “file_exists” or both?
...
dont forget to check if is_writable also
– Drewdin
Mar 24 '11 at 21:46
10
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Get itunes link for app before submitting
...Store for your apps and company: developer.apple.com/library/ios/qa/qa1633/_index.html
– eldermao
Jun 22 '14 at 6:19
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