大约有 9,000 项符合查询结果（耗时：0.0408秒） [XML]
Using two values for one switch case statement
...nt. Control flow continues with
the first statement following the switch block. The break statements
are necessary because without them, statements in switch blocks fall
through: All statements after the matching case label are executed in
sequence, regardless of the expression of subsequent...
What are the differences between vector and list data types in R?
...
As someone who's just gotten into R, but comes from a C/Java/Ruby/PHP/Python background, here's how I think of it.
A list is really an array + a hashmap. It's a PHP associative array.
> foo = list(bar='baz')
> foo[1]
'baz'
> foo$bar
'baz'
> foo[['bar']]
'baz'
A vector is a f...
use localStorage across subdomains
... Apple has updated the defaults on Safari 7+ both on desktop and mobile to block 3rd party data. The option is now called "Block cookies and other website data" which refers to things like localstorage which are now completely isolated by domain. This method wont work in Safari
...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ion is assigned to the variable following as. After every statement in the block is evaluated, the __exit__() function is called.
紧跟with后面的语句被求值后，返回对象的__enter__()方法被调用，这个方法的返回值将被赋值给as后面的变量。当with后面的代码块...
How do I test an AngularJS service with Jasmine?
...per' way to do it is using 'inject' and 'module' in a 'beforeEach' jasmine block.
When doing it we have to realize that the 'inject' function it's not in the standard angularjs package, but in the ngMock module and that it only works with jasmine.
describe('myService test', function(){
describe...
Android - how do I investigate an ANR?
...our case the ANR was likely a longer operation, rather than something that blocked the thread permanently, so the event thread recovered after the operation finished, and your trace went through after the ANR.
Detecting where ANRs happen is easy if it is a permanent block (deadlock acquiring some l...
Trees in Twitter Bootstrap [closed]
...t: 20px;
overflow-y: auto;
padding: 19px;
a {
display: block;
overflow: hidden;
text-overflow: ellipsis;
width: 90%;
}
li {
list-style-type: none;
margin: 0px 0;
padding: 4px 0px 0px 2px;
position: relative;
...
How do I prevent node.js from crashing? try-catch doesn't work
From my experience, a php server would throw an exception to the log or to the server end, but node.js just simply crashes. Surrounding my code with a try-catch doesn't work either since everything is done asynchronously. I would like to know what does everyone else do in their production servers.
...
Could you explain STA and MTA?
...ion, it's also necessary for the runtime to prevent a COM object call from blocking the user interface, if a call is made from a user interface thread.
An apartment is a place for objects to live, and they contain one or more threads. The apartment defines what happens when calls are made. Calls to...
Most efficient way to determine if a Lua table is empty (contains no entries)?
...irst climb up the local tables, so if there is a local next in the current block, it will use that, then climb up to the next block, and repeat. Once out of locals, it will only then use the Global Namespace. This is a dumbed down version of it, but in the end, it definitely means the difference in ...