大约有 21,000 项符合查询结果（耗时：0.0458秒） [XML]
Run JavaScript code on window close or page refresh?
...
There is both window.onbeforeunload and window.onunload, which are used differently depending on the browser. You can assing them either by setting the window properties to functions, or using the .addEventListener:
window.onbeforeunload = function(){
//...
Eloquent Collection: Counting and Detect Empty
...ount()) { }
if (count($result)) { }
You could also use ->first() instead of ->get() on the query builder which will return an instance of the first found model, or null otherwise. This is useful if you need or are expecting only one result from the database.
$result = Model::where(...)->...
Repeat Character N Times
... Jason OrendorffJason Orendorff
35.5k33 gold badges5555 silver badges9090 bronze badges
4
...
Setting the selected value on a Django forms.ChoiceField
...
TomTom
34.4k3030 gold badges8888 silver badges9797 bronze badges
3
...
How to check programmatically if an application is installed or not in Android?
...edInstanceState) {
super.onCreate(savedInstanceState);
// Add respective layout
setContentView(R.layout.main_activity);
// Use package name which we want to check
boolean isAppInstalled = appInstalledOrNot("com.check.application");
if(isAppInstall...
How to set the environmental variable LD_LIBRARY_PATH in linux
...
You should add more details about your distribution, for example under Ubuntu the right way to do this is to add a custom .conf file to /etc/ld.so.conf.d, for example
sudo gedit /etc/ld.so.conf.d/randomLibs.conf
inside the file you a...
Eclipse copy/paste entire line keyboard shortcut
...
andrewrjones
1,6201818 silver badges2424 bronze badges
answered Feb 23 '10 at 21:42
Pierre-Antoine LaFayettePierre-Antoine LaFayette...
Create an Array of Arraylists
...ocumentation:
"You cannot create arrays of parameterized types"
Instead, you could do:
ArrayList<ArrayList<Individual>> group = new ArrayList<ArrayList<Individual>>(4);
As suggested by Tom Hawting - tackline, it is even better to do:
List<List<Individual>&g...
Remove directory which is not empty
... Morgan ARR AllenMorgan ARR Allen
8,94322 gold badges2929 silver badges3232 bronze badges
1
...
Unexpected Caching of AJAX results in IE8
...l option:
$.ajaxSetup({
cache: false
});
which will cause jQuery to add a random value to the request query string, thereby preventing IE from caching the response.
Note that if you have other Ajax calls going on where you do want caching, this will disable it for those too. In that case, sw...