大约有 15,640 项符合查询结果（耗时：0.0324秒） [XML]
Does every Core Data Relationship have to have an Inverse?
...ontext deleteObject:appType];
BOOL saved = [managedObjectContext save:&error];
What we expect is to fail this context save since we have set the delete rule as Deny while relationship is non optional.
But here the save succeeds.
The reason is that we haven't set an inverse relationship. Bec...
Refresh image with a new one at the same url
...s the image in an <img> tag, otherwise you'll get an "Access Denied" error when trying to call iframe.contentWindow.reload(...).
Pros: Works just like the image.reload() function you wish the DOM had! Allows images to by cached normally (even with in-the-future expiry dates if you want them, ...
Is there any way to kill a Thread?
...eads with id tid'''
if not inspect.isclass(exctype):
raise TypeError("Only types can be raised (not instances)")
res = ctypes.pythonapi.PyThreadState_SetAsyncExc(ctypes.c_long(tid),
ctypes.py_object(exctype))
if res == 0:
...
The differences between .build, .create, and .create! and when should they be used?
...ore succinct.
.create! is equivalent to .new followed by .save! (throws an error if saving fails). It's also just a wee bit shorter
I think .build is mostly an alias for .new. It works one way in Rails 3 and another way in Rails < 3.x
The most important part, however, is that these methods can...
d3 axis labeling
...trick for days scaling with a date format ?
d3.json("data.json", function(error, data) {
if (error) throw error;
data.forEach(function(d) {
d.year = parseTime(d.year);
d.value = +d.value;
});
x.domain(d3.extent(data, function(d) { return d.year; }));
y.domain([d3.min(data, function(d) { retur...
Get current clipboard content? [closed]
...nsole.log('Pasted content: ', text);
})
.catch(err => {
console.error('Failed to read clipboard contents: ', err);
});
Or with async syntax:
const text = await navigator.clipboard.readText();
Keep in mind that this will prompt the user with a permission request dialog box, so no funny...
How to write asynchronous functions for Node.js
...ted immediately but passed around as callbacks.
How should I implement error event handling correctly
Generally API's give you a callback with an err as the first argument. For example
database.query('something', function(err, result) {
if (err) handle(err);
doSomething(result);
});
Is ...
Check if a String contains numbers Java
.... If it does, then I think this will produce an "illegal escape character" error.
– w3bshark
Sep 29 '17 at 15:51
this ...
Link vs compile vs controller
...nt or its parent. The name can be prefixed with:
? – Will not raise any error if a mentioned directive does not exist.
^ – Will look for the directive on parent elements, if not available on the same element.
Use square bracket [‘directive1′, ‘directive2′, ‘directive3′] to require...
How to convert List to List?
...
I'm getting an error when omitting the arrow syntax. This works: List<string> sss = new List<string>(); IEnumerable<int> test1 = sss.Select<string, int>(x => Convert.ToInt32(x)); but this does not: IEnumerable<...