大约有 44,000 项符合查询结果（耗时：0.0653秒） [XML]
Whether a variable is undefined [duplicate]
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jQuery.val() and .text() will never return 'undefined' for an empty selection. It always returns an empty string (i.e. ""). .html() will return null if the element doesn't exist though.You need to do:
if(page_name != '')
For other variables that don't come from something like jQuery.val(...
Remove a JSON attribute [duplicate]
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The selected answer would work for as long as you know the key itself that you want to delete but if it should be truly dynamic you would need to use the [] notation instead of the dot notation.
For example:
var keyToDelete = ...
What is the Auto-Alignment Shortcut Key in Eclipse?
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Ctrl+Shift+F to invoke the Auto Formatter
Ctrl+I to indent the selected part (or all) of you code.
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CSS rule to apply only if element has BOTH classes [duplicate]
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So, this will not select <div class="abc"> because it lacks xyz?
– Majid Fouladpour
Apr 26 '11 at 21:30
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PHP date yesterday [duplicate]
...ands ISO8601 for time intervals, but date() doesn't. At the end of course: Select the one you better fit your needs :)
– KingCrunch
Apr 12 '12 at 8:19
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Get element type with jQuery
...e type of an element with jQuery? For example, is the element a div, span, select, or input?
7 Answers
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public friend swap member function
...call:
using std::swap; // allow use of std::swap...
swap(x, y); // ...but select overloads, first
// that is, if swap(x, y) finds a better match, via ADL, it
// will use that instead; otherwise it falls back to std::swap
What is a friend function? There is confusion around this area.
Before C++...
Android studio: new project vs new module
...d" name="Android">
<configuration>
<option name="SELECTED_BUILD_VARIANT" value="debug" />
<option name="ASSEMBLE_TASK_NAME" value="assembleDebug" />
<option name="COMPILE_JAVA_TASK_NAME" value="compileDebugSources" />
<afterSyncTask...
Regex - Should hyphens be escaped? [duplicate]
Hyphen is a special character in regex, for instance, to select a range, I could do something like:
3 Answers
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Sqlite or MySql? How to decide? [closed]
...to want to run several queries at once, or run a workload that has lots of selects and a few updates, and want them to go smoothly etc.
a lot of memory usage, for example, to buffer parts of your 1Tb database in your 32G of memory.
You need to use mysql or some other server-based RDBMS.
Note that...