大约有 21,000 项符合查询结果（耗时：0.0368秒） [XML]
NSUserDefaults removeObjectForKey vs. setObject:nil
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Yes, both lines of code are equivalent, both will result in nil read
id obj = [[NSUserDefaults standardUserDefaults] objectForKey:@"example key"];
NSUserDefaults will return nil if the key was not found. I would recommend to use the removeObjectForKey instead of setting it to nil.
here is ...
How to disable typing special characters when pressing option key in Mac OS X? [closed]
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I was having the exact same problem, in the exact same IDE.
The solution to this is to download Ukulele from here:
http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=ukelele
In the application you can create a new keylayout using File -> New from current source...
Is JSON Hijacking still an issue in modern browsers?
...bed in http://www.thespanner.co.uk/2011/05/30/json-hijacking/:
(http://jsfiddle.net/ph3Uv/2/)
var capture = function() {
var ta = document.querySelector('textarea')
ta.innerHTML = '';
ta.appendChild(document.createTextNode("Captured: "+JSON.stringify(arguments)));
return arguments;
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jQuery append() vs appendChild()
...ppend.
You can pass multiple arguments.
var elm = document.getElementById('div1');
elm.append(document.createElement('p'),document.createElement('span'),document.createElement('div'));
console.log(elm.innerHTML);
<div id="div1"></div>
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In Postgresql, force unique on combination of two columns
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CREATE TABLE someTable (
id serial primary key,
col1 int NOT NULL,
col2 int NOT NULL,
unique (col1, col2)
)
autoincrement is not postgresql. You want a serial.
If col1 and col2 make a unique and can't be null then they make a good prim...
Using Rails serialize to save hash to database
I'm try to save a hash mapping ids to a number of attempts in my rails app. My migration to the database to accommodate this new column:
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How to clear/remove observable bindings in Knockout.js?
...ement to dispose of the in memory bound objects?
var element = $('#elementId')[0];
ko.cleanNode(element);
Then applying the knockout bindings again on just that element with your new view models would update your view binding.
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JavaScript: how to change form action attribute value based on selection?
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Simple and easy in javascipt
<script>
document.getElementById("selectsearch").addEventListener("change", function(){
var get_form = document.getElementById("search-form") // get form
get_form.action = '/search/' + this.value; // assign value
});
</script>
...
Why does viewWillAppear not get called when an app comes back from the background?
...factoring you can do to achieve the same effect might be as follows:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self doMyLayoutStuff:self];
}
- (void)doMyLayoutStuff:(id)sender {
// stuff
}
Then also you trigger doMyLayoutStuff from the appropriate noti...