大约有 47,000 项符合查询结果（耗时：0.0357秒） [XML]
How does database indexing work? [closed]
...ive million rows and is unindexed. The performance of several queries will now be analyzed. These are a query using the id (a sorted key field) and one using the firstName (a non-key unsorted field).
Example 1 - sorted vs unsorted fields
Given our sample database of r = 5,000,000 records of a fixe...
javascript: recursive anonymous function?
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(function foo() { foo(); })();
is a stack-blowing recursive function. Now, that said, you probably don't may not want to do this in general because there are some weird problems with various implementations of Javascript. (note — that's a fairly old comment; some/many/all of the problems desc...
How can I recognize touch events using jQuery in Safari for iPad? Is it possible?
...tically passed to the handler. For the safari browser (and android too) it now contains an array of all the touches the user has made on the screen. Each touch has its own properties (x,y coords for example)
– David Pean
Jan 21 '11 at 6:05
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How to expire session due to inactivity in Django?
...ion on every request like so.
request.session['last_activity'] = datetime.now()
and add a middleware to detect if the session is expired. something like this should handle the whole process...
from datetime import datetime
from django.http import HttpResponseRedirect
class SessionExpiredMiddlew...
Debugging WebSocket in Google Chrome
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Chrome developer tools now have the ability to list WebSocket frames and also inspect the data if the frames are not binary.
Process:
Launch Chrome Developer tools
Load your page and initiate the WebSocket connections
Click the Network Tab.
Sele...
.prop() vs .attr()
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@Neal: If you want to know what properties DOM elements have and how attributes may seed their values, keep these links to hand: The DOM2 HTML specification, the DOM2 spec, and DOM3 spec. The indexes in each case are excellent and link you straight...
SVN - Checksum mismatch while updating
...eted the folder where was a problem file and I updated the entire project. Now it seems to be ok.
– Koralek M.
Apr 27 '12 at 15:40
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Displaying a message in iOS which has the same functionality as Toast in Android
I need to know if there is any method in iOS which behaves like Toast messages in Android. That is, I need to display a message which is dismissed automatically after few seconds. This is similar to the functionality of the Toast class in the Android environment.
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Action bar navigation modes are deprecated in Android L
... class (such as setNavigationMode() , addTab() , selectTab() , &c). are now deprecated.
10 Answers
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How do I seed a random class to avoid getting duplicate random values [duplicate]
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@AndréChristofferAndersen How do you know? dilbert.com/dyn/str_strip/000000000/00000000/0000000/000000/…
– joppiesaus
Apr 4 '14 at 15:53
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