大约有 45,000 项符合查询结果(耗时:0.0665秒) [XML]

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List changes unexpectedly after assignment. How do I clone or copy it to prevent this?

...t everytime. Why is this, and how can I clone or copy the list to prevent it? 22 Answers ...
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Javascript foreach loop on associative array object

Why my for for-each loop is not iterating over my JavaScript associative array object? 9 Answers ...
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Getter and Setter?

...t a PHP developer, so I'm wondering if in PHP is more popular to use explicit getter/setters, in a pure OOP style, with private fields (the way I like): ...
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IIS7 Permissions Overview - ApplicationPoolIdentity

...eed an overview in terms of the permissions. Previously, when needing to write to the file system I would have give the AppPool user (Network Service) access to the directory or file. ...
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Can't use Swift classes inside Objective-C

I try to integrate Swift code in my app.My app is written in Objective-C and I added a Swift class. I've done everything described here . But my problem is that Xcode haven't created the -Swift.h file, only the bridging headers. So I created it, but it's actually empty. I can use all my O...
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Difference between File.separator and slash in paths

... With the Java libraries for dealing with files, you can safely use / (slash, not backslash) on all platforms. The library code handles translating things into platform-specific paths internally. You might want to use File.sep...
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Original purpose of ? [closed]

... (unchanged) sent back to maintain a kind of a state. Precisely. In fact, it's still being used for this purpose today because HTTP as we know it today is still, at least fundamentally, a stateless protocol. This use case was actually first described in HTML 3.2 (I'm surprised HTML 2.0 didn't inclu...
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How to pull a random record using Django's ORM?

I have a model that represents paintings I present on my site. On the main webpage I'd like to show some of them: newest, one that was not visited for most time, most popular one and a random one. ...
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Difference between Hive internal tables and external tables?

... Hive has a relational database on the master node it uses to keep track of state. For instance, when you CREATE TABLE FOO(foo string) LOCATION 'hdfs://tmp/';, this table schema is stored in the database. If you have a partitioned table, the partitions are stored in the data...
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Which is faster: while(1) or while(2)?

... Both loops are infinite, but we can see which one takes more instructions/resources per iteration. Using gcc, I compiled the two following programs to assembly at varying levels of optimization: int main(void) { while(1) {} return 0; } ...